The poor usability of modern interfaces certainly doesn't come from people who care about what it's like to use it in practice. It comes from people whose main skill lies within the field of aesthetics.
What should you call yourself if you're actually interested in working with usability, and happy to leave the visual design to others?
UX.
Most serious people in UX who see job postings mentioning "UX/UI" avoid those jobs in the same manner that a C++ coder would avoid "C/C++".
But I agree that doesn't do much to dissuade people who don't quite know the difference (or what it is that they actually need or want) from advertising "UX/UI" or "C/C++" and then people applying to these jobs.
There being "impostors" in the field who bluff their way through, while regrettable, does not imply that the whole industry is made up, any more than the existence of people applying to data science jobs with nothing but excel skills says nothing about data science.
And some companies really, really need UX people on board.
Now, I'm someone who insists on having a UX/UI person in the team when I'm making an app, as I want it all to go well, and I don't mind spending a chunk to get it, but the number of people I've found who can actually do that is vanishingly small compared to the number of people who are billed out as expensive UX consultants.
This is often a motte and bailey distinction though, where the "UX" person's background is UI, and they think only about UI. But they can charge more because theoretically UX is everything.
I don't think this is an individual's issue, as if everyone hires UX instead of UI then what do you do? It's a UX consultancy issue.