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Smash Master
Banning, or not-banning, of stages, sadly, has become very hereditary, so to speak. Early in Smash4 there was a widespread adoptation of Brawl's legal stagelist (including Delfino, Halberd, and Castle Siege), addition of Town and City and Duck Hunt (but some opposition on various grounds), and so on. It's only been over a pretty wide time span that more and more tournaments are cutting Siege and Halberd in the presence of other sufficient options (Dream Land, for instance). Even Delfino gets a lot of flak and gets cut at some events. There are cases where the criteria at issue are what need to be evaluated for the new game being played, for instance. 75M is slightly different from how it was in Brawl (I believe, and could quite likely be wrong, but the top platform can now be dropped through, and the springs are somewhat less powerful), but the critical characteristic of being massive and circle-campable hasn't been changed. Stadium 2, by comparison, had the strength of Electric's conveyors reduced, amongst other tweaks. While eventually people figured Flying makes for a highly polar match phase that can give some characters fresh 0-to-death combos, up until that there was plenty of reason to reconsider its legality. Heck, if items had been reworked to spawn fully predictably, they'd even be worth a reconsideration or selective adoption since that changes a significant minus-point against their use.I have 2 problems with your argument.
1. You comparing the process for banning stages as the same for banning customs. First of all, the banning of stages took place over time and was due to results of experimentation. The ones that were eliminated immediately were eliminated due to objectively possessing qualities that, through previous experimentation, were unfit for competitive play. Either that or they shouldn't have been eliminated at all, but that's a whole other argument.
2. You completely ignoring the evidence. We ran customs. Nothing like you described happened. Villager was annoying but not broken (not to mention he's been nerfed since), WFT was viable-ish, DK was trouble to people who were ignorant, and we saw slightly higher placings for B tier characters overall. There were non of these upsets you described, and even then you've yet to describe how this would be a bad thing necessarily.
My source:http://shoryuken.com/2015/07/19/evo...argest-fighting-game-tournament-in-the-world/
Customs are different, though they face some of the same resistances. Customs are fighting a further uphill battle by being a new introduction. Many of them include previously somewhat uncommon, or outright nonexistent, functions to characters. Windboxes and armor are unusual to a lot of specials that get them in a customs environment, and Timber Counter adds an extremely rare trip option that appears to the uninformed to have no counterplay options or drawbacks. Even if you get stubborn players past these, we're fighting a presently and historically conservative community (ruleset wise) to directly add something to the game, and in contrast with balance patches and engine changes, they are given, and arguably even encouraged to use, the option to keep these off and unused. To make matters worse, most pro-customs players are still pretty alright with playing default Smash even if they think it's lacking. By comparison, anti-customs players go out of their way to assault the mere notion of changing your moveset. It's hard to even run both rulesets alongside when the loudest childish screaming suggests that you'll get no attendees if you so much as set a system up for customs-on friendlies. When the very thought of having the opportunity to prevent Counter Timber or Hammer Spin Dash from ever seeing the light of day again was proposed, regardless of the hundreds of other moves, people supported removing things they didn't like, at the "low" cost of other things they disliked, don't know exist, or at best don't care about.
We can't win by being logical or rational, when the rules of the war don't depend on rationality or logic. Anyone can be a textbook scrub about removing something because it's not "fun" or "fair", but as long as it's the scrubs who hold the power, all we can do as pro-customs players is... what, be the quiet minority that still goes to and supports the major competitions because ours doesn't exist? The only way I see customs coming back at this point is if EVO and/or some other major decides "Screw you kids we're still playing customs. Learn them or forfeit our prize money." I wish I saw it otherwise, but having spent the lifespan of the game beating my head against a wall trying to make people see that customs are a good thing by the competition argument, and a good thing by the balance argument, and a good thing by the fun argument (for at least as many players as use them), just to be told "Nuh-uh you're stupid," the future is looking bleak.