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Holy fuck this thread is retarded. Hearing people use the slippery slope fallacy on /vp/ to bash smogon is almost as bad as people using the buzzword 50/50 on smogon.
No, keeping the most broken stuff in OU doesn't make OU a better tier. To make an OU with Mega Kang/Luke acceptable, they would need to drop a third of ubers into OU to equalize the power. That means a ton of Arceus forms, Shaymin-S, Darkrai, Deoxys-N, Reshiram, and Kyurem-W dropped into a tier to combat the power creep and diversify the metagame. Or they could simply ban the stuff that's obviously too strong for OU, which is what they do now.
Mega Mawile has always been extremely potent but since it's a mega it was fighting a losing battle for a team slot. Having the highest attack in the game wouldn't be a problem without great bulk with intimidate to help it on the first turn, the ability to boost, a movepool that allows it to pick its counters, an absurdly good typing, and 80 BP priority.
People are seeing a slippery slope when it isn't there. There are other factors at play that are showing you a slope. Since smogon doesn't suspect in batches anymore it looks like each new suspect test is in reaction to the last, but for the most part they've been queued up in this order for awhile. Saying more stuff will be banned since Aegislash left OU looks like a compelling argument until you actually think about it. Aegislash had a cheesy mechanic that punished nearly every physical attacker in the game, a typing and stats that made it pull double duty as an amazing pivot and a great attacker, and a movepool just large enough that it could nail anything that comes in to counter it. This isn't what you want to pin balance on.