Hello there! I'm not affiliated with EA in any way, but I can provide some light (or actually the lack of it) to this matter. Unfortunately this is the reality of gaming nowadays. You do have companies that work harder to deal with hackers, and some that don't. It also differs on a game basis, not only on companies. Apex Legends, also from EA, used more resources to curb hacking, whereas Battlefront and Battlefield used just a little (Battlefront probably got the shorter end of the stick here).
But I think the best way to approach this is to remember this is a business first and foremost. They have a set of resources and they have to assign everything in the most profitable way. Maybe some decades ago gaming companies would first think what their audience might like the most as a way to expect the most profit. Nowadays though they've realised this is not as important (and we can all see it, especially the bigger the company). They have had decades of experience, tons of money to spend on research, and a lot of execs honing their skills on milking their playerbase. Nowadays Hype is more important. Gambling is more important. PTW is more important. And so on.
Considering this, we can go back to the development cycle of Battlefront 2 (the one I followed the best I could) and realise they were going by a playbook. Firstly they dug their own grave with the MTX fiasco at launch (that was actually unexpected). This made them use so many resources trying to reimplement the progression system that the game was doomed to fail. Nevertheless they managed to do it while bringing a few new things into the game, and fixing some serious BUGs that they couldn't fix before launch. That all happened during the first semester since the game launched (maybe a bit less). IIRC the game started getting news that big things were coming just after the Solo drop, more or less the same time the progression system was totally revamped.
Meanwhile hackers, exploiters, and BUGs were destroying any motivation on the players to take this game seriously. As EA started to shift their priorities, DICE had to reassign stuff and then anything related to anti-cheat, BUGfixing, or dealing with exploits was left with less and less resources. But they knew from the start that they didn't want to treat this game seriously. And when one does that, they might expect less problems with hacking, but in reality it's just that there isn't anything serious behind it to make an anti-cheat more necessary, because hackers will happen everywhere and everytime. Same applies to BUGs and exploits. So in a way, EA and DICE were already considering that Battlefront (both 2015 and 2017) weren't to be taken as seriously as Battlefield for example. SWBF II 2017 even got the stats page killed, because devs 'didn't want the playerbase to feel the pressure to keep their stats high, as this game isn't competitive'. To me this is just to save face when it comes to the backlash, because as there's nothing serious in the game, there's no need to make such a fuss when the game doesn't work, hackers run rampant, and only through exploits you can get to the top.
This pattern remained until the end, with all 3 issues I mentioned getting less and less attention, while the fewer and fewer resources they had all went to bring new stuff into the game. In the end DICE was very successful in their endeavor. They turned a dead on start game into a 'good game'. They managed to keep sales going with all the new content they brought through the almost 3 years of development.
I understand you mention SWBF 2015 more, and all I said applied to SWBFII2017, but I don't think it was that much different with SWBF2015. The game was already doomed from before launch, as they knew they wanted to make a sequel. SWBF2015 was made to create a path to make SWBFII2017, which was the one supposed to remain alive for "years to come", a Live Service game. So when SWBF2015 got plagued with hackers, exploits, and BUGs, they rather work on their 4 DLCs, that had to be launched fast (because they also had to develop the sequel already), instead of polishing the game, as it was never meant to last long.
All that to say: EA doesn't prioritize, as much, dealing with hackers, especially when it comes to games they tag as 'not as important for that'. Bringing Apex Legends here again, as it was supposed to be competing with the most competitive games out there, anti-cheat was prioritized from the start (not as much as some would like, but a lot more then anything other EA had at the moment), and it was EA's flagship on the Battle Royale genre. What to expect from the inferior cousin of Battlefield?
Also, this is speculation, but at this point I think execs at EA (and probably other companies as well) do like their late hackers (not initial hackers though, only late hackers). They would love to kill their older games as they take away resources (especially servers for online play) that could be better spent elsewhere. So if hackers kill the remaining playerbase of old games, then they can more quickly turn them off. I don't think they actively encourage that, but I'm sure they are aware of this "benefitial" side-effect, and it just takes complacency to take advantage of that. They ignore hackers, they take long to take action, they require hundreds of reports to give temp bans, and so on. Just by being slow and inefficient they are already helping hackers kill off their older games, which helps them in turn to save resources. When it comes to EA's reasons and actions, this is all speculation, but in practice it's already happening due to their poor response to hacking in general.
Also a bonus here, EA hired a former hack maker for both SWBF2015 and 2017 back around 2019. I can't name him here due to the No Naming and Shaming policy on this forum (even though the fella became an EA employee). You'd think they did that to help the game against hacking, but nothing has changed. My impression is that he got hired because after doing a lot of hacks that plagued both games for years, he then proceeded to work on legit mods to help the community, one in special was a stats page for the PC community, and after that he got hired. EA saw talent not in the BUG/Exploit fixing or Hack curbing fronts, but probably on more profitable things like new content or backend improvements.
This is all I got for now, I hope it helps your curiosity. From your friendly neighborhood BUGhunter, who himself got perma banned by EA in 2022 for helping them by finding, reporting and fixing BUGs free of charge since early 2018. EA's priorities always at the best places!
