Put simply you do not care which is fine. Dooku was not openly Sith at the time when mind wiping Gunray etc would make sense.
Saying "star wars and retcons go hand in hand" is a fallacious argument. The OT didn't retcon as it was just information not yet revealed to the characters or audience, it did not contradict what came before. But even if, for arguments sake, we were to say "yes, even since the OT there have been retcons" that doesn't suddenly make it ok. In fact, it becomes more of a sin the more it happens.
We don't say that a modern car lacking airbags and seatbelts is fine just because "they lacked them from the beginning", no one would think that a valid argument. We expect things to improve over time, be they cars or the art of filmaking. We expect storytelling to improve, for direction to improve, vfx to improve, dialogue to improve and so on because the people working on these projects have the benefit of learning from the past successes and mistakes of those that came before.
The low expectations you set are kind of the problem. "I don't care" you said of power creep, so you are happy with with that aspect of story telling getting lazy and inconsistent. People not caring is why Star Wars is becoming so bad. The fanboys don't care to demand better, the creators don't care to make better quality shows/movies and that results in sub par content that makes general audiences reach the point where we are at now, where what was once THE franchise is now considered stupid and not a must watch saga. Now, because fanboys didn't care to demand better and just accepted slop, because the creators didn't care and just served slop, the general population does not care about Star Wars. It is death by a thousand cuts.