It’s all ultimately subjective. No one answer is correct but I do think the original creator no matter who they are should be given the chance to complete their life’s work. Unfortunately life doesn’t always go the way we want it to and this is a case of that.
I mean, George sold his life’s work for $4 billion. He didn’t have to do that. Disney didn’t steal it from him. Sounds like Iger gave him the impression they would follow his treatments more closely than they did, but he just as well could’ve made the Sequel Trilogy on his own terms.
George is getting up there in years. He had a choice between devoting another ten or so years of his life to another trilogy, or to spending that time with his family. It’s understandable why he decided to hand the series off at his age. And he and Bob Iger spent quite a long time negotiating the sale, with George wanting a more firm promise that his treatments would be used. But George ultimately gave in and settled for a verbal assurance from Iger.
(Of course, he could have worked on the ST earlier, but back in 2005, he insisted that there never was going to be an ST, so I suppose he didn’t want to back then.)