I think using class level is a flawed benchmark. I understand why people do it. It does in theory suggest someone has made an effort to level up. And obviously when people are in low digits they deserve an insta-boot for insane and above because they won’t have unlocked all the cards and certainly won’t have levelled them up.
The problem though is that because of boost and also now because of the 4-6 XP events, you can have high class level characters with low level cards. I have a level 16 veteran, nomad and anchor, and they all only have level 2-3 cards. Why? Because I grinded out Surge Escape runs on a 6xp weekend. I would be utterly useless in an insane horde frenzy with those classes, but I would avoid booting because you cannot tell what cards people are running. Meanwhile there might be a level 10 class with level 4-5 cards because they ran no boost or didnt play on xp weekends, that can contribute more than me but they get kicked because they are judged by their class level.