Not unless there's a good reason. And even then, domino effect: banning one move makes it much easier to ban the next one that is deemed "broken" or "jank."
Only move people have a widespread "issue" with, is Timber Counter. More so than anything else (at this time). There's a lot that can be said about what that move is all about, probably an arguable example of degenerate play at a
theoretical level.
Seeing as the climate right now is very messy, the extreme sides are going to immaturely harp on anything said as a representation of the argument. Every intelligent player knows more time is needed for any argument to hold water.
The term you're actually looking for is "slippery slope", and it's a fallacy.
If anything, KTAR proved that good enough players will figure out ways to overcome degenerate strategies. Look at ADHD vs. Tweek. Tweek figured out how to beat the ledge strategy, and forced ADHD to switch to Diddy Kong, where he won, because ADHD's Diddy is among the best.
One tournament is enough to convince you it's fine yet tournament results that would note otherwise wouldn't be indicative to your standards. The amount of good players ADHD did beat when his Smash4 results thus far are generally on the infrequent end of things,
this was DAY ONE usage of customs by ADHD and he was playing against those with several months more tournament experience than him [in smash4]. A lot of players like Zero/M2K see the 'undeveloped but still successful' as an indication of something dangerous in the long run, you shouldn't choose to ignore that.
There's an eSports perspective and then there's the rest.
Chances of something being broken enough that it'll 100% decide matches instantaneously undermines Sakurai/any sane balance team. If your standard is "press button once and the victory screen comes up" then that's never going to happen and you'll be on the extreme side of the political spectrum.
Everything is beatable, and nearly always will be. characters planking was
beatable, and planking before there was an LGL weren't singularly winning tournaments or dominating results over the best players in every region, MK was getting rather close to it though. The strategy's impact on the rest of the scene though? Pretty dire seeing as
Meta Knight was the most popular tournament character. An LGL was a band aid solution to it though, as it didn't stop people timing out the last 2-4 minutes of the game while staying within said limit.
Villager may never be the most popular tournament character. They may only garner one or two high/top level mains and the regions that accommodate them may eventually call foul. The "it's beatable" argument will to most people still be solid enough reason, yet at that point the damage is already there and by the time we realise the game is dying (as that strategy gains more popularity) it'll be way too late (Ice Climbers).
I dislike pulling the "Brawl player" card, but it's the one nearly every long-term Brawl player I know personally uses as the basis for their fear.
We've seen this all before in almost a deja vu type of way, we've watched the game die while power brokers remain petty and obstinate.
It's dangerous for us to dictate what are valid winning strategies, the "if it's campy/not rush down it's cancer and must die" is a generalisation. But gameplay that results in one dimensional character interaction is something we ultimately don't want to see (neither do you). We aren't there yet,
nor is there any guarantee we'll ever be there, but the great players shouldn't want to be forced into mastering a character they feel promotes "toxic" play. Mastering a character (or a strategy) takes time, you won't be seeing it used successfully at any early point. Find me the top level player using Villager from the get-go with good results taking the customs-meta by storm; there is none.
"doesn't instantly win matches hence it's fine"
vs
"omg broken, players using it don't deserve to win"
Don't be at either end of the scale, be somewhere in between.