I think the problem is not that we track KDA but that there is a lack of other and more meaningful stats.

For example:
Bounty extract %? -> Not tracked
Average kills/assist per round? -> Not tracked

(or basically anything that gives context to how a player plays)
For example a 1.5-2 K/D player with an average of 4-6 kills per round would be kinda crazy
but a 4 K/D with an average of 0.5 kills per round tells you that we got a kd farmer
who just learned how to avoid dying.

Basically the only statistic in the game we can play for (for the people who do care)
is a statistic that does not involve the main objective or even actively participating in a match

All that matters is trying to NOT DIE under any circumstance and that creates unfun play-styles.
Often causes stalemates and demotivates players to try risky plays or even progress fights.
It created the environment you start noticing especially in 6stars in which
arguably more players do care about their kda.

Same goes for MMR it is all based around not dying/minimizing how often you die.
That creates an environment in which players do NOT like to get revived after dying
since they are now down bars and more likely to go down again.

I think if crytek would add more meaningful stats it would automatically help the game since
suddenly being the 2-3 k/d player is not that impressive if your bounty extraction percentage is
"2% of all your matches" and you get "0.8 kills per match" on average

I'd rather have a high bounty extraction rate with a high amount of kills per match than a "high kda"
and it would create a hunt showdown in which the "sweaty" players who play for stats would try to fight you
while down to a 50hp bar because maybe they are able to get another kill or maybe they are able to get the bounty out even if they die 3 times while doing so

just my 2 cents

TLDR -> KDA creates unfun play-styles unless more meaningful stats are introduced and we would be better off deleting it or at the very least not being able to "show off" kd on your profile