It should also be pointed out that both of their up smashes are also one of the two Standard Sword Up Smashes, the other being ironically the one you praised Ganondorf for being so "unique".
And on top of that, Roy and Chrom are the only ones with that up smash that actually try something cool with it. Like, I don't care if you see them as the same because of the similar animation, Roy lighting his sword on fire is ****ing badass and it makes it more memorable than any other upward stab up smash.
....They usually are the win condition, unless another move has better KOing potential or is less risky while still being rewarding enough and those are rarely jabs or tilts.
Are you telling me that you only play the game by spamming smash attacks rather than actually using faster normals or some specials to build up damage, start some combos and even potentially set things up to, I dunno, land a SMASH ATTACK to take the stock?!
Not saying it's a wrong way to play if you say yes, but I would say that it certainly explains your point of view.