When you really want to get to the bottom of what's wrong with Main lobby, it's that the issues are self-perpetuating.
Main lobby is overran with trolls/banned users/gamethrow accounts to the point where most new users probably just quit or don't bother getting involved in the community. Just look at how active the forums are compared to even a couple years ago, they're basically barren. Not to mention the fact that competitive rounds are getting less and less players.
Why is that though? Because moderation is just getting apathetic.
It's impossible to judge everything as black and white when it comes to the rules so you'd think the moderators would rely on utilizing their judgments and trying to base their decisions on what would be good for the site or improve it right? Wrong.
For some reason the rules are treated as laws and most verdicts are decided upon because they're either the easy choice or to just avoid conflict/people lashing out at the mod. There's silly things like this happening:
https://epicmafia.com/report/238139a troll account created just to be annoying and try to incite people into making homophobic comments using a pretty overtly sexual background of two people kissing
Or maybe this one
https://epicmafia.com/topic/87981someone made an account named after a man who helped Hitler rise to power and have created countless threads on their alt to complain and argue against it just to cause problems
The underlying issue is that trolls are being given too much leeway and too much of a platform to just berate and harass moderators to the point that they aren't actually moderating the site anymore