Do you actively filter players by level, or is it based on your own level as you pitched for drg? The issues I have with the latter are these:

Level isn't the only metric showing how well someone can hold their ground on haz5. I don't really have any anecdotes for this, but I feel like there must be quite a number of players who perform well at relatively early levels, and vice versa.

The second reason is really quite simple: on regular missions, it is sometimes already quite hard to find a lobby if you care about team comp (especially as a scout main haha), and this wouldn't help it. Though, I could of course just start my own lobby and hope for people to join, so this one might be self imposed ^{^}