The arbitrary lock would change absolutely nothing in this regard. The people making random chaos levels just suck at making levels and likely won't learn what really makes something fun, just keep spewing out randomness. You can still create a massive shitshow with the basic set, too.
Plus some other elements don't even really add anything but more options. Sub options are VERY late to get yet random chaos would do nothing with this, so that just stifles actual options/creativity. Not having the mario trail from the start is just silly as hell, too.
The crux of the issue here is the majority of people don't have a taste for what makes a level good. The amount of 100% blind jumps where you have a specific landing area and nothing like coins to guide the player, the instant a level starts having an enemy behind you, dumb traps that are funny the first time but not when every level does it eveywhere, etc. This stuff would still be happening. At best you would maybe have a bigger flood of garbage easy/normal levels that have nothing in them, I guess.
They just need a better sorting and filtering option so you can play a bunch of fan favorites that aren't just steamrolling the top starred anyway like the autoplaying levels or the amiibo ones(like that splatoon level at the top, which is unremarkable in every way). These options matter far more than anything the creators can do.
