I think the problem is that I was playing cinematic-feeling games beginning in the '80s. (Late '80s, to be fair.) A game being "cinematic" isn't new to me. And the parts of PbtA that are actually new ... I just don't grok the appeal of. As in I don't like it and I don't understand what it is people who like it see in it.
I don't like Savage Worlds, as an example, but I see what some people enjoy in it. It's just not for me. I can see what they were going for. I can see how someone might enjoy the outcome of it. I just happen to not like the system. Ditto for GURPS or even D&D: I don't like it, but I see what the appeal could be.
With PbtA I don't understand it enough to even see what it is people like about it. And I can't find an "explain like I'm five" overview that closes that comprehension gap. All of the intros seem to presume I know what's appealing and are intent on showing me how to do it. None of them explain the actual appeal, leaving me lost.