Kakashi getting PS wasn't all that bad because it was like a quick thing and then it was gone forever. And the nerf was to be expected, honestly, even if he'd never gotten DMS.
Obito was (secondarily?) responsible for the most boring arc of the franchise, was constantly placed next to a villain cooler than him who ultimately upstaged him (Madara), had uninteresting motivations, and was predictable af
But I dunno, people seem way more butthurt about Kakashi, whereas Obito's nonsense is generally seen as a joke, except by his fans