100% this.
If you look at the authors from 4 to 6 years ago (or more even) that made sexdance stuff at the time, you'll notice that most of them are waaay better than the guys making stuff today. Consider the tech difference, back when MMD was *way* more limited & blender was still a massive, unwieldy clusterfkk that was incredibly user hostile in a bunch of ways. Maya as always was very expensive but also highly impractical for individual use. Etc.
Also remember that PC hardware has advanced significantly while getting a lot cheaper... despite all of this, guys like Krag, Kuro@vov, Modesto & others, still made better stuff years ago than the vast majority of sex dance videos made today. That's because they actually put effort into their stuff and made videos with flow rather than re-arranging the chairs in the same room over & over.
....
I've been seeing so much lazy, uninspired crap come out recently that I'm starting to think maybe even I could do better. We'll see.