Practice is doing something ever so slightly different each time until you perfect it. Once you get to a point of perfection (which you never really do), you do the same thing over and over again expecting the same result... that muscle memory will now take over and you do whatever it is without conscious thought.

So no, it's not quite doing the same thing over and over again. If that were the case, you'd suck just as much after 10,000 hours as you did at the start and be far more frustrated because you expected to get better, but you were doing the same wrong things with every iteration.

Depends. Doing the exact same thing may make you faster at performance. Up to a limit of course.

Or it may cause mistakes elsewhere. Determinism of this kind is for children.

Doesn't doing something faster count as slightly different?

This is what I was thinking, but I didn't pursue the argument because "determinism is for children" struck me as an ad hominem argument and I have better things to do than argue with that.

Also, from the "scientific method" perspective, if the quote were true there would be no reason to keep e.g. the Large Hadron Collider running for years on end; the Higgs (and other particles) would have been detected on the first run, and that would be it. In this case, we are quite literally doing the exact same thing over and over, under extremely precise control and mitigation of external influences.

This is actually quite a good rebuttal. I'll have to remember this one.

Tossing a coin repeatedly should result in a random distribution of events over time.