I generally agree with this, and I would go further to say that it is in part an issue with the number of Pokemon which are designed more like specific characters than like a species. A lot of the anthropomorphic Pokemon fit into this category, which further makes them too person-like. This can be a result of not just design but also with a Pokemon having too much of a specific story to feel like a species. Even in terms of humanoid/job-based Pokemon, I think there's a difference in the level of "specific character" design between "every Hariyama is a sumo wrestler" versus "every Incineroar is a heel in professional wrestling" or "every Cinderace is a uniform-wearing soccer player" or "every Palafin is an ordinary-looking citizen who becomes a superhero at the sign of trouble". To me, the latter three just don't work as a species, and if you were to, say, have a pack of 10 in the wilderness it would feel weird. Even a relatively humanoid Pokemon like Hatterene doesn't have this problem, because its design elements don't feel as specific to an individual.
I suspect that this trend has to do with marketing, where having a more specific story makes the Pokemon more appealing. Mimikyu is another example of this (even though I do like it), where it has the "aww, the poor thing wants to dress like Pikachu so people will make friends with it" story. And what do you know, it's astoundingly popular and it's been placed onto the teams of 3 Gym Leaders in a row. The first two at least make sense, since it matches with the "shy, spooky child" theme. Ryme has a very different personality and it's pretty obvious that it was just shoved there because it's popular. It feels like there are more Pokemon which are designed specifically to be the next Pikachu or Charizard or Lucario in terms of popularity, and a lot of them are "specific character" Pokemon.
The
increased number of legendary/mythical Pokemon (which are usually also specific individuals and not an entire species) is also a symptom of this, where a lot of the time the "specialness" feels like just a way to increase popularity (even though a full 18/128 or ~14% of Gen 9 Pokemon, if legendary Paradoxes are counted, are legendary/mythical).
The problem is that having so many Pokemon all trying to be special and appealing makes the newer Dexes feel very saturated. It's basically the equivalent of dumping salt, sugar, and oil into every food product. Yes, ultimately every Pokemon is designed to appeal to people (and make money). I still think that it's way too blatant in recent gens, that there are ways to make Pokemon cute/interesting in more subtle ways, and that having so many Pokemon which don't work as a species is artistically unpleasing.
