A Few Suggestions
So I want to say that Respawn has done an amazing job at keeping this game fresh for its players. They're always pushing the envelope with new ideas and things for us to enjoy.
The only thing you need to know about me with regards to this suggestion is that my first Battle Royale that I spent a lot of time in was PUBG. I think many others here reading will concur with that. It was pretty much what launched BRs into what they are now.
I still feel as though PUBG has/had the best gunplay of any BR to exist. This came from each weapon having its own "feel." A lot of my friends were AK mains. Some were M4 mains. Some liked Bolt Action rifles, others preferred DMRs like the SLR. But the one thing that made it unique was how you could further customize your gun, mid match by the attachments.
The only other thing I will say before I get into the attachment suggestion is that within the last several updates, Respawn changed the model for the G7 Scout to include a foregrip. If they could make models of these weapons with and without these types of grips, it would make this suggestion even more polished.
My suggestion is instead of working as hard as you are to make new game modes, why not look at your existing weapons? The customization is lacking I would say. There's no "decision" to be made based on what attachment other than the Optic. Some people in higher level play prefer 3x on a R-301, some prefer 2, some prefer 2-4 variable. But what if these guns could be further customized with different kind of grips, stocks, grip tapes and more.
Another thing they could add is a suppressor which is something I think many people would enjoy. Suppressors would help with the amount of 3rd partying because if a team starts a long ranged engagement with suppressor, and they provoke the other team (that doesn't have it) into said long range engagement, it would make other teams zero in on the team that wasn't suppressed. Suppressor in my head for Apex would just limit the range by which you could hear the gunshot, and change the gunshot sound itself. I know suppressor would require the team to make each gun have its own unique sound, but I feel with their resources it wouldn't be too farfetched of an idea. Suppressors could also take 1 bullet damage off (for balance) and also give no recoil stability which would make some favor this new attachment while others would prefer to do more damage despite being loud and proud.
The themes for these suggestions is customization. I know that word if scary to a dev because where we read "customization", they read "what balance issues would it have?" - I'm not asking for all of these next update. This is just something the team could sit on and ponder on overtime.
Another customization option would be different armors. And before I go into that, I do believe the gold shield should be allowed to evolve to 125 shield and thereby increased in rarity. The gold shield should be a sought after item. It shouldn't be one of those things that is "vaguely" better than a blue armor but not taken over purple. The issue with Gold is that it limits you from progressing your evo armor to eventually get red which, a 5 second battery for 125 is a lot better than a 3 second cell for 50. With the ability to craft batteries, they are never in short supply with how many replicator stations are in the maps.
But my idea is to have different color armors, green, pink ect. You could come up with any number of ideas. Maybe one type of armor would allow reduced damage from the zone, which would be beneficial to some who like fighting on the edge of the ring. Maybe that could be better suited in a different colored helmet (similar to a gas mask in Warzone). Maybe certain armors would give you additional grenade slots, similar to a vest having the ability to put the grenade on the vest. Maybe a certain type of armor could give additional inventory space for ammo packs, or even make it to where each existing pack in the inventory would be 80-100 ammo instead of 60 (if you equipped that).
The point is, different types of evo armor which would be considered as "rarer than purple" would all have the ability to go to 125, but would add a different spice to the game.
Last suggestion based on customization, and that is expand on the current existing legends abilities. I recall the dummy event where one of the abilities was a loot pinyata, and the other one was an AOE heal that healed everyone in its radius (even enemies) -- which would serve a purpose in some situations and would require careful decisions in the heat of a battle. That AOE heal really jumped out to me as a potential Lifeline "ult" because let's face it, some people like her package and find it useful, and others get the ult but never drop it because their team doesn't want to wait or it's too inconvenient, or there's no where they can drop it. You could make these abilities dropped in each match, or able to be chosen as a customized "loadout" before entering a match under the Legends tab. Either way , I think it would be a fun way to explore customization for these Legends in a new way.
Last suggestion that would be fun as hell to have in the game is a set of revenge voicelines. Let's say you encounter a team, you die to a wraith, that wraith then kills you, but your team mate gets the banner and runs away to respawn you. Later in the game, if you kill that wraith, your character would make a quippy remark about revenge because that person had killed you before, and now you just got your revenge for it. Just a thought, but I think that would be dope AF.
Thanks for reading!! :D