This is why stories that a alter an origin, like Mopee or the Byrne SPIDER-MAN CHAPTER ONE, are so unwelcome: it DOES matter where the Flash's speed comes from (accident or magical elf), or whether Spider-Man and Doctor Octopus were created at the same time.
Yeah, but I don't see how you can lump post-Crisis Superboy into this category. He's not a character whose origin was settled and then later changed. He's a character whose origin was left mysterious and then revealed bit by bit. If you read the Superman's Rebirth arc it's clear that whether Superboy is Superman's clone is
not settled. The very first SB story, if I remember rightly, ends with Luthor asking his Cadmus mole "I thought you
couldn't clone Superman?" The mole answers "Well, yes and no. Listen, I'll tell you everything." And then the scene fades out.
Though I do believe that characters are the sum of their history, not just bite-sized soundbytes, there is something to be said for origins that are "tight." A character like Batman with an origin that can be given in a sentence is stronger than a character like Cable or Spider-Woman.
I think both settled origins and mysterious, developing ones have their place. Neither is inherently stronger than the other -- it depends on the kind of story you're trying to tell. Settled origins are pretty much a necessity for series that are mostly episodic, where what happens in one month's storyline is usually forgotten by the next. When you've got more of a continuity, there are more options.
As for Steel, I suppose we'll just have to agree to disagree.