You main the best character in the game. It proves my point. Again everyone to the sentiment to those who supports customs shjould just be a big F.U.C.K YOU to the top tier mains, becayse they're the only ones ******** about them.
People who main top tier characters aren't exactly getting a raw deal by participating in a customs environment. Characters like Sheik and Rosaluma actually benefit from customs iirc, maintaining their top tier position and generally being better for it.
General opposition to customs from what I've seen stems from the perception of 'jank', i.e. what people view to be degenerate gameplay states caused by the use of a customs meta. 0% kills from windboxes, or infinites (Pikachu, lookin' at 'chu), excessive camping (customs villager), moves that kill at very low percents (skullbash, crescent slash at the edge, etc). Not to mention that despite the 'optimised' ways to obtain customs, it's still a pain in the ass to set yourself up with all of them.
There are legitimate concerns with what customs does to the game, and people are right to oppose them if they think they're too problematic to overcome. Trying to trivialise what they're saying by boiling it down to 'you don't want to lose top tier status, get bent' is one of the big reasons this debate is a mess.
I think, with Amazing Ampharos having already set up the groundwork for customs integration and regulation, that egregiously offensive/janky customs can be easily examined and removed from customs sets for a smoother tournament experience in a hypothetical customs meta. I'd like to go that route, since I'd love to see more characters become viable and start taking tournaments. It's just getting over that initial perception of customs being janky and showing that a little bit of dedication through the aforementioned project can make it all work out.
It'll just be interesting to see if EVO will start bigger arguments or just settle the dispute.