@UP_Hawxxeye If we speak strictly from meta gaming PoV. In a duel between two skilled FPS players, the one who can take even slightly more shots have the advantage.
Skill levels are rarely equal in twitch battles. That being said, the game is not based on a skill set. New players have to suffer with gun progression. Then there are players like me who are T1 mongers. Currently I am grinding C5 so armor makes zero difference in my game atm. The game is not designed for 2 people with the same skill set and same load outs to face off.
Also the significance of the extra bullets to kill is inversely proportional with the rate of fire of the weapon. A fast firing weapon will see the least difference. A slow firing weapon will be dramatically weaker.
ROF definitely has a place in the math. That being said, slow firing weapons do more damage. If there is that much skill a slow fire head shots would win. Additionally, if twitch battles were all that defined the game, there would be one weapon and maps would be far different. The game is not designed as I described above, it is a R/P/S design
I do not know how active you might had been during the BFV times but we had a certain crisis at the time.
After BFV released in November 2018, DICE did a patch during Christmas 2018 that made almost all the weapons need 1 more bullet to kill. People hated that because it messed up the gun balance and muscle memory.
DICE did a patch that mostly reverted those changes soon after.
Then on around Christmas 2019 for some reason they did almost the same patch again and people were furious again (ruining the goodwill they generated with the Pacific maps) and they semi reverted it again.
Angel's armor distribution is in a way a similar but temporary Bullets -To-Kill patch that is unpredictable and inconsistent since some soldiers (those with no armor) need fewer bullets while others (with armor) need more.
I hope that helped explain this whole afair a bit
Game history in design progression is important. It shows us why we have what we have today, and gives DICE a direction. That being said, Ive been here only for one real patch. I would love for them to roll back 4.1. Of course that isn't going to happen, and with the continued nerfs of specialists, I can see where this game is going. In the end, I still do not believe the armor is game changing and OP. This is supposed to be a R/P/S environment. That is why the specialists have the skills they have.