By superbosses, you can probably assume it's a boss that's harder than the last boss, if there was one. You'd be right.
Yeah, the major trend I've noticed with these guys is that they appear in a lot of RPGs and RPG remakes that need more content aside from fixed dialogue, newer and more powerful equipment, etc. Based on the whole free-roam thing, that's what they're generalized for: the ability to find them after doing something, then backtracking somewhere else.
Hell, they don't even have to match with any storylines (unless it's the Dream Devourer from the Chrono Trigger remake, which sets part of a plot in Chrono Cross)
Anyone think it would've been cool to face a tougher colossus in that secret garden area in Shadow of the Colossus? Or to have a hidden path that leads to one in any other possible genre, like an FPS or Survival?
I feel that way sometimes because the only things that scale to difficulty are the fact that many games now put in difficulty settings, and that the only thing you'd have to do to get 100% completion is find all the easter eggs and beat the game on the hardest difficulty there is.
tl;dr: games need superbosses.
