lol, someones salty, must not be that good, probably has like a 2.0 kd lol something very average. and kd does matter.... kd is literally the amount of kills be life you get on average. if its high, that good, you're helping you're team a lot by staying alive and killing enemies, someone who has a 1.0 or lower is very very very detrimental to their team. and honestly shouldn't be playing bf1 in the first place
How are they detrimental to the team?
In a game mode where kills = a win ( TDM for example ) , I would agree K/D is more important in that particular game mode.
You can go negative K/D and still top the scoreboard in other modes such as conquest, Particularly if you are reviving / dropping health / dropping ammo / fixing vehicles / spotting and so on and so forth.
So no, Unless the game mode is one where more kills = a higher chance of winning, Then K/D does not matter as much.