If people are against customs at this point, they're either against them because banning them would
A) give them an advantage because their best set is closer to 1111
B) give them an advantage because they would lose bad matchups
C) reduce frustrations because they don't want to learn more matchups and prefer a smaller skill and knowledge requirement
D) give them credence in their social circle
or
E) they're dumb or ignorant
Some combination of the above.
"Customs take too long to unlock" / "Tournaments can't reliably get customs"
Yeah, it's annoying, but not impossible. We have yet to have any major issues and now TWO majors have run with customs with no issues. It takes planning. First tournament in a region with customs can be rough, after that it's typically smooth sailing.
"Customs are janky / customs are too good / some other balance complaint"
Customs haven't changed player OR character results at the top level in any meaningful way. The finals of EVO was two 1111 sets, and those that used customs used only one or two per set, but the names weren't particularly surprising.
"Customs only haven't changed results because top players don't use customs"
Yes they did. More importantly, if you feel that more custom use = better placement, the same players that were predicted to make top 8 still made top 8.
"If customs don't change results, why have them in the first place?"
Because they change the game at other levels of play and allow for the possibility of more unique counterpicks and character choices.
"Customs take no skill / are spammable"
Lots of things are spammable, lots of characters are easier than others. If customs were so brain numbingly easy to use, we'd have seen results variation very quickly.
"(name of top players) are against customs"
So? Mango's a top player in Melee and he thinks Smash 4 sucks. Zero's a nice guy and is skilled and all, but he's ranted about almost everything at this point. He complained about Lucario, for pete's sake. ESAM talked about how broken thunder wave + HSB was for pikachu and the guy got 7th and lost a game to a G&W.
Top players don't know everything.
"It's not fair for other characters to get better moves when all my customs suck"
That's because 1111 is your best. You started at where they want to be.
"It's not fair to force people to get customs"
We force them to do stuff all the time. We force them to spend money on DLC now. We force them to unlock stages, characters. If they want custom sets, we can put them on their wii u via 3DS.
"It's too much for a new player to learn, too high a barrier of entry"
Melee dwarfed Smash 4's numbers on EVO's stream and it requires you to literally sit in your room and practice against a level 1 CPU for hours to even move your character properly. It's doing fine. Having to watch a youtube video on characters you don't already know won't kill anyone.
Honestly, at this point I'm done with smash. The smash community is mostly scrubs, but there's just so many now it's hard to not have your voice drowned out.
We were told that customs would be too hard to run at a regular tournament, then we did it.
We were told it'd be too hard to run at a national tournament, then we did it twice.
We were told that DK's wind up+b was broken, that thunder wave and HSB were broken for Pikachu, that Mii Brawler was broken, that Mario's Gust Cape was broken, that Wario's Fast Bike was broken, that Diddy's explosive barrels were broken, that Marth's crescent slash was broken, that Luigi's ice fireballs were broken, that Rosalina's shooting star bit and warp were broken, and NONE OF THESE MOVES have had more than a marginal effect on tournament placements.
Every doom and gloom announcement around customs has been incorrect, but it doesn't matter. The people that don't want customs don't care that customs are balanced, they don't care if they bring no negative effects. They decided a long time ago that they didn't want customs and no evidence will sway them because they weren't interested in trying them in the first place.