They’re not even that low ranked in popularity or usage, so this seems unlikely to me.
Come on, don't confuse popularity with people wanting a
specific functionality. The idea that most people pick a class because of some nerdy definition of functionality that they've almost certainly never heard of or thought about is tad silly. Especially as it's not even "Tank, DPS, healer" which people might have heard of, but some dubious "versatility" deal which they likely haven't.
The vast majority of people picking classes in D&D are doing so either because those are classes have a concept they like. Whether the class actually works well is like, not even a secondary consideration for most people. Which means it's fortunate that in 5E, most classes, including Monk, work okay.
Every Monk I've ever seen played in 5E, and it is a few, it's been because the player liked the concept. It's the same with most classes. I can't even say it's different for me, and I'm an optimizer. I am constrained by I'm only going to pick classes/subclasses I see as working well, but within that large pool, I actually pick based on the concept.
This actually highlights what is probably 5E's strongest point relative to 3.XE/PF1 and earlier, which is that you can just pick a class and trust that it doesn't suck. This was also true for 4E, but somewhat obscured by various factors (and 4E had the downside that a DM couldn't trust the class not to be broken, whereas with 5E you can reasonably assume that if you don't allow MC'ing, and be pretty much completely certain of it if you don't allow Feats as well).
I think being one-trick pony is fair criticism. If you have one ability that is really good and everything else is kinda meh, it leads to just constantly spamming that one ability and that's really not fun gameplay.
Exactly. Snarf seems to think he's highlighting a contradiction, but he isn't. Monks are good at one thing, and that thing isn't
that great, and the way in which that one thing works is extremely boring for literally everyone involved. If it works, it's just a beat-down on a helpless target, which is effective but not interesting and the Monk is basically relegated to being the guy who hold's another kid's arms whilst some bullies punch him the stomach and then take his lunch money.