We'll have to agree to disagree on this. I never saw Michael live but I have seen other performers start their show by just standing still and it is electric. Adam Ant used to do this in 1980. I saw James Brown do it in 1973. It remains the most mesmerising start to a gig that I've ever seen. Better than Adam in 1980 cos James held it for a lot longer. Not as long as Michael, I don't think, but long enough.
Obviously, doing it in a gig venue is massively different to doing it in a huge sports stadium. And I'm sure there were a few people in the crowd who would have been confused and / or bored with Michael's opening stance. But I still think it was a genius move. There is no reason for a performer to immediately rush into action, noise, activity. Why not challenge the audience and their expectations?
I just don't see it as a waste of time. I love the audacity, the chutzpah, the challenge to convention that it takes to do something like that. I'm not saying everyone present in that crowd on that day would have loved what Michael was doing. I'm sure some people were bored, some probably hated it. But he wasn't there to warm up the crowd. He's an artist. Plus, as I understand it, he was the first really big artist to do the half-time thing. At that point there were no expectations of how he should approach it. The 'frozen stance' photo is still the most commonly used photo from that performance. I think he called it just right.