I absolutely see the appeal to this. The first movie came out when I was in first grade, right after reading Sorceror’s Stone as my first “grown up” book. I don’t remember a lot from being in first grade…but one thing that sticks out is me walking out of the theater with my dad and being absolutely pissed that there was no Peeves in the movie.
I think this is less for new fans and more about de-Hollywood-ifying the original series. A faithful adaptation with no runtime requirements, more advanced visual effects, and more room for advanced character arcs and darker content seen in the books could be really cool. While I get the skepticism seeing how Disney milked Star Wars dry and other networks completely giving up on creativity, HBO has a track record that shouldn’t be bet against IMO.
As a very casual Harry Potter fan, I’d watch this.