I don't disagree..
That is, if you're going to do a rising grapple, might as well try to break it so you can attack, but I used to TRY to *** cancel, resulting in unecessary deaths where I could've just up-b'd.
Same thing for beam-cancelling: Don't drop a bomb planning to beam-cancel it, but if you do drop a bomb for some reason and see a good opportunity to beam-cancel approach, I think then it's not a bad idea.
So it's somewhat fair to call both moves obsolete, but I would just say "Don't plan these moves, but if you're halfway there and they seem advantageous, go for it". At least that's how I feel about them.