Also, I tried to play the last two seasons in main and then advanced, and it was a gigantic headache both times going back and forth with admins about restrictions. Figuring out which players they'll let us play with/on what classes and then them going back on their previous decisions, shit is so dumb and has definitely made me and most of my friends not want to bother playing again. My essentially pubber/6+ year since playing open friends tried to play a few years ago and got put in main because Niko Jims plays highlander engineer, they got like 5 rounds total in the entire season (3 of which were me ringing on medic lol), they were all so frustrated with the experience they said screw this and didn't play again.
Obviously I get not wanting a super sandbag team to roll the division, but a no-scrimming team of washed up invite players who haven't properly played in 3+ years is not that big of a deal lol. All the restrictions actually end up doing is rewarding players who are scrimming actively now (vs 3 years ago) and actively deter older heads from wanting to play. Directly undermining player retention, at the benefit of *theoretically* saving newer players from the terrible fate of having to play vs better players (pro tip: it actually makes you better at the game to play better opponents!) is not a very good strategy long-term.