EDIT: Seems dynamic music is back in style in some very recent games, many of which I haven't really played yet. Good. 
For me, it's dynamic music, the kind that some games had that adjusted moment by moment to what was happening in the game.
The best-known example of this in the 90s game TIE Fighter, where the moment more enemy (or allied) ships showed up the music would have a little additional flourish to acknowledge the shift in battle. There were pre-battle tension tracks, battle music, complications of battle, grandiose flourishes for the arrival of enemy or even allied capital ships, and victory and failure music all ready to flow into the next seconds of the game.
A lesser-known but still excellent example of this was in Ultima Underworld and its sequel, where drawing a weapon had its own special "preparing for battle" tension music, getting attacked had a jump-out-of-your-skin joltingly sudden musical start that actually scared me as a kid when I got ambushed, music for battles going well, going poorly, victory and defeat.
I wish more games did those sort of second by second musical changes, but they've sort of fallen out of fashion for the most part. 
Yeah it was for player retention, but also a lot of the people they were retaining are probably kids that shouldn't be on the game in the first place. Player retention under capitalism isn't out of pride for the franchise or friendliness - it's to maximise profits. Look at franchise shooters these days - I'm not begging for a return to the 'piss filter' days of the 2000's but every game is marketed with a battlepass full of flashy camos and colours and epic wacky outfits because they explicitly want an audience of children (despite the game officially being 16+). Games feel infected by all of this hyperstimulating garbage (I know that's what gaming is in the first place, but it's worse than ever), and every game is more than ever chasing trends that Fortnite started. I know that's a tangent, but it feels like it comes under the same area.
It's not a serious issue - it's just preference. BF2042 was the first Battlefield to do it and I picked it up recently, and it just feels weird not being able to check how you're doing. Kills are wrapped up with assists at the end of game - but you can get an assist by knocking 1HP off a guy or possibly even just 'spotting' them. You can only see your OWN KDA in certain game modes. It's just strange. I'm not going to stop playing my favourite franchise because of it, but on top of all the other 2042 issues it just feels strange.
It only sounds like 'cod lobby veteran' shit if you read it that way - I said the complete opposite. I can't remember a single time I've had toxicity in over a decade of COD. Especially not gameplay - there isn't even really a way to grief in such an Arcadey shooter as COD - maybe in the new Warzone mode but I've never put hours into that.
I don't know why you're trying to paint me as some internet smuglord trash talker - back when I played dota I had thousands of commends for friendliness. In battlefield I sacrifice my KD to get revives and keep the team rolling. I like team stuff. It's why I'm bad at COD - it's much more of a solo game. I've always been a positive mental attitude player. I'm not letting people know they need to get better - I want that KD for my own personal information. If some guys gone 96/5, maybe I should go follow them for a round and see what they're getting up to. Would probably have a good time tearing up the map and supporting in their wake. I specified that the ribbing is reserved to your friends.
It seems like you've twisted what I'm saying to epicly PWN me for the hexpoints ratio.
tbh I think we should both get a life
ok