I recently watched 'Harry Potter 20th Anniversary: Return to Hogwarts' and I'll try to describe my emotions in a few words, although it probably won't be possible in few words.
I can't say that I've always considered myself an ardent fan of Joan Rowling. Of course, like many people, I've read all the 'Boy Who Survived' books and watched the movies. Was it worth it to release an extra episode after all these years? Probably. But only with the direct (rather than archival footage) involvement of the creator of this universe.
Over the course of an hour and a half, the viewer is introduced to old familiar actors, but only much older/older, talking about how this wonderful world of magic was created. And at times it's really interesting, except that watching characters who talk so awkwardly or generally 'forget to mention' the one who created the world of Harry Potter is either silly or extremely hypocritical. And it's not just the insincerity that's felt. One gets a vague sense of the production (however punny it may sound in film format): the actors exaggeratedly exchange disarming smiles, climb into each other's arms and eagerly recall their failures in the 'company of old friends'. Sometimes there is only shame in what is happening.
And the quality of pitching can't fix this situation. If you invite and shoot an episode, then only all together, not those who have not comprehended the culture of cancellation (yet). Otherwise, it is better not to even try. This is just one more example of a trend that has gone too far.
I look forward to 'Avatar: The Way of Water'.