Listen this from a non pro but veteran who has played all halos since Halo CE, I just finished to play this mode so called attrition to never play it again, only reason for me was to get the punk hair effect.
I think I never played a game mode that frustrating in halo, specially with the paring system, killing a bunch and then when I am killed I often discovered that my lazy team just exhausted all lives, sooo I have too waaaaait, really? wait on 2022? for my team to be killed, because of course they won’t win, why should they?
I think a game mode to make you wait intentionally is out of scope nowadays, the paring hey! whatever, you cannot have always a good team.
You should bring something like head hunters from reach, I remember myself winning alone those games.