Even though I have always classified Star Wars firmly as fantasy and not sci-fi, I find the Holdo maneuver utterly unforgivable. TBH Starkiller Base was almost as bad, take the two of them together and intragalactic combat in the Star Wars universe should be instant and apocalyptic. Why even build spaceships when you can just point hyperdrives at your target from any distance, or just laser them from across the galaxy?
Of course I don't expect the movies to follow this train of thought, but that's frankly why it's a problem. The people writing this shlock don't think about the ramifications for two seconds, they just do what sounds cool and let the fans figure it out. But it really shatters any suspension of disbelief, and exposes how grossly uncurious the writing leads are about the universe they're crafting. All big movies are profit-driven, but it's nice to see at least some amount of effort to disguise that fact.