Honestly, I bet this happens way more than people realize.
I dont remember where I read this, it was in some random conversation or other, I saved it for some reason, but it's basically this:
"You have to watch the art online for 10+ years to notice that middle-skilled artist have almost disappeared from web and products, and so did most artists with unique styles and quirks. It's either amateur art or almost perfect rendition of a common style."
And when I think about it, this is completely true. Like, even just on DeviantArt (and everywhere else I look), almost everything I see on there is like, general anime art style, or something more like a style that Disney movies used to use, and sometimes very cartoony characters. But within those categories, it's... just the same thing over and over again. It's like when someone hits what would be considered an expert level of skill, they somehow just produce things that look like everything else. The characters can look different of course, but the same styles are there, and it's very rare to see something that feels unique. Or, something that was the artist just entirely being themselves, instead of just following a common art trend because they were told it was "how to get better". And every tutorial and guide and whatnot is all aiming directly at some super-common style, something like that.
I'd actually gotten quite frustrated with it myself, as so many tutorials and guides and how-tos just make me feel like I'm painting by numbers, and then I get bored and lose interest. And I'm betting that professional courses and classes would have the same effect.
As it is, pretty much all of the artists & creators that I find inspiring, all the ones that made me want to make stuff myself, all have styles that are just totally "out there", where it's clear that they just sorta went "heck with it" and did it their way. But these are very rare. Or at least they seem to be... probably, there are plenty out there, but the vast majority of them either keep it to themselves, because they fear they'll be told off for it, or they just get really discouraged because what is "good" to everyone else isnt what they want to make, so they feel nobody will like their creations. I mean, heck, even I do that, most things I make get wedged into my supply stacks where nobody else is going to find them.
Well, that's sorta what that article made me think of anyway. Someone making really creative stuff, but hiding it, thinking others might hate it, not seeing that in reality it was pretty great. I mean just look at those wood things... those are amazing. The amount of time and effort that must go into each one, I cant even imagine. And then they all get hidden away.
That's just my own thoughts on it though.