Would you describe super-hero fiction (movies, books, comics, etc.) a sub-genre of Fantasy?

GuanoLad:

I can see that, though a distinction can be made between Bond (or, to put it in the context of super-hero universes, Nick Fury) and what people think of as super-heroes due to the use of costumes. Of course, in recent years, there has been a tendency toward street clothing (or something greatly resembling it) among super-heroes, and that blurs the lines further.

You’re moving the goalposts. You said the difference between magic and science is that science is repeatable. Magic in the Harry Potter universe is absolutely repeatable - any wizard that casts the same spell gets the same results, and new magic techniques are being regularly researched - which, I presume, involves a fair amount of trial and error. The fact that only certain humans can get magic to work at all doesn’t change anything - it just indicates that there’s another factor at play besides waving a wand and speaking bad Latin. Probably a genetic factor, given that wizarding ability appears to run in families.

And that’s a pretty standard depiction of magic in fantasy literature: a thing that you need to be taught, even if there is some natural aptitude necessary beforehand. And teaching pretty strongly implies repeatability, otherwise what’s being taught?