But they're still all variations on the same theme, aren't they? Of course he would change things up here and there, but in the end it was all pretty similar, lacking spontaneity. I, personally, am not bothered by this necessarily although, I do wish he would have changed things up a bit more, but I can still understand why other people might be.
Your post reminded me of a funny moment from the MJCast: Jamon Bull mentions the fact that Michael wore a black jacket on the 30th anniversary shows and says that it was a big deal. Charles Thomson had this to say about it:
"It reminds me of when fans say 'oh no the HIStory Tour concerts aren't all the same because in Gelsenkirchen he did the Charlie Chaplin walk in Smooth Criminal' or something. Well, if that's the one thing that you can point to that was different during a show then you're kind of demonstrating the problem. Basically, if you've seen Michael perform Beat It on the Victory Tour, then you've seen every Beat It performance he ever gave and that's kind of a shame."
While I do think he is exaggerating it a little bit, what he is saying is not incorrect either, because the performances were, all in all, very similar to each other and there was never a performance that suffered a radical change over the years.