You seem to be asking if there's nothing which can be objectively defined as "bad." Given that the context for that question is with regards to personal enjoyment in recreational games of imagination, where the only metric is
à chacun son goût, the answer should be obvious.
Not at all.
What I'm saying is that people float this idea that limitations breed creativity as though it is a conversation ender, when it isn't. Limitations include a huge space of things. Some of those limitations really do breed creativity. Others simply limit; they don't lead to any better results and often lead to worse ones. I can of course
construct limitations that obviously suck, but it's not hard to point out a common one that clearly does not have a "less is more" effect.
"No, you can't play an X because I think they're stupid."
That doesn't create flavor. It doesn't spur creativity. It doesn't add to the thematic structure of the result. It doesn't improve internal consistency or enhance immersion.
The one and only thing it does is piss in the Cheerios of whomever liked that option.
And yes, I have been told,
many times, by actual users on this forum, that they ban things
plenty for the sole and exclusive reason that they think those things are dumb. Not because they're harmful, nor powerful (often they're anything
but powerful), nor exploitable, nor super weird. Just because the GM thinks it's badwrongfun and no one can have badwrongfun at their table. I have seen numerous GMs, here and elsewhere, who
gleefully delight in talking these things away from players, because it means the GM got to stick it to all the big dumb idiots who like that badwrongfun stuff.
Those are bad limitations. I don't need objectivity to call that out. They simply fail to produce the results claimed by the pithy but flawed maxim.