Probably it's my forties talking here, but I am under the impression that the content and the format (including the length) is being leaned towards the 15-25 years old range.
For (our) work stuff, it's all 30 minutes "learning tutorials", for a kid getting hands on a programming language or tool, or the couch-video-watcher-curious.
I honestly don't have the time to look for tutorials of work stuff on YouTube (I don't even have audio on my work PC). If I must, I prefer to watch a lecture from a professor in some university. Text-format tutorials are always welcome.
What it leads me to my next point: everything in YT is entertaiment. No matter what, the main scope of all those video is to entertain people first, and teach later.
And for the entertainment PoV: for example last night I watched "What Makes This Song Great?" from a "Rick Beato". It's a musician that does an analysis about a song. Other than leaving me with a sense of "emptiness" the guy never REALLY explained "What Makes This Song Great". Perhaps a 25 yo sees this guy as an authority, or doesn't care wasting time, but I personally felt scammed.
I'll keep using YouTube to occasionally watch a trailer or an old music video clip or a live performance.