Diminishing returns. Yes lets punish people for playing more. I'm sorry your too good at this game so we have to slow down and or cap your xp/tickets influence per mission/hour whatever.
The best thing to bring AE in line with the rest of the game is require custom groups to have minions, lts, amd bosses. Sure that kills any challenge all boss maps but really those are all just farms anyway. Heaven forbid you see a minion, had a guy quit my team saying wtf this mission has minions lol.
It's a double edge sword. AE lets the players do a lot of things. Auto side kick, custom enemies, map selection, ambushes, captives, etc etc. So really if you want to start cutting out features or implementing limits your going to curb creativity, I guess it's up to the devs to say if your mission is "acceptable" with no real guide lines other than a poorly laid out here's what you can build in MA but if you build a "farm" mission it will get banned.
Making your own missions is awesome. If your one of the simple minded people that think AE should be gone, well you probably already quit, saying the devs should make the content that's what I pay them for not get the players to do it. I mean that's just nuts and I saw someone say it lol.
Look here's the simple thing. Play the missions you want. Don't worry about the other guy and hope the devs have the common sense at this point to just fix anything that is a blatant exploit or bug.