Re the Harry Potter play, I had become so accustomed to long expository world building that the script felt jarringly terse. The story itself was fine, and I tend to agree with the criticisms above. I just wish all that blank page space had been filled with words.
I do, too, but I think the biggest problem was to give the characters a challenge - a narrative challenge (not a character challenge which Scorpius and Draco - and indeed, Albus to a lesser degree - managed impressively) - in the absence of Lord Voldemort.
When your nemesis has been killed, - and his armies defeated thoroughly, his vision lies in tatters, while his surviving followers - those that haven't been imprisoned - are living in discreet disgrace how do you convey a fundamental threat to your new world?
The Potterworld equivalent of retribution coming from those hanging out hiding in the jungles of Brazil or the Altiplano of the high Andes isn't going to compel an audience to give consideration to the possibility that Lord Voldemort's scattered followers might return: After all, they had returned once before - some of them from Azkaban - and - eventually, after a terrifyingly close shave, true, - were completely defeated for a second time.
I thought the glimpses of what might have happened had certain key events turned out differently - or, not happened at all - very interesting. (And that is something that could have been explored to a far greater degree). And yes, I also thought it - telling, that word again, - quite telling, in fact - that the most horrible version of Harry himself appeared in an alternative world. (That was also something that might have been worth exploring further).
However, I regret that some of the surviving characters - Ginny is the obvious one - weren't fleshed out further; Hermione (as always, great value - I've loved her as a character from the very beginning) and Ron are recognisably themselves, but Ginny - who was no shrinking violet - was shamefully under-utilised.
Draco's character arc was very satisfying, though, and I'm very glad to see it.
Likewise, I was pleased to see a more nuanced take on the whole idea of Slytherin, and what Slytherin represented, as - while that House played host to most who supported the ideal of blood purity nonsense, for narrative purposes, it was too easily the default narrative 'shorthand' for a portrayal of what 'being evil is all about - (though, granted, some attempt was made to present a more complex portrait with the introduction of the character of Professor Slughorn, and what we later learned about Severus Snape), - other themes, such as power corrupting, or, just Because You Are On The Side Of Good Doesn't Mean That You Are Always Good could also have done with examination.
But, yes; while I enjoyed this, I'd have preferred to see it as a fully fledged book. A fat, heavy, inviting book, stitched solidly between two hard covers.......