Sure, I don't see why not. If you think it's the best move available to you, you go for it, right? And at least sometimes, it is the best move, maybe even by far. As in any scheme that doesn't specifically forbid it as part of its design, there's nothing wrong with using all the tools available to you at any time.
But I don't think the 5 star Torch and Drill are even better than the 3 star ones for attacking... certainly they're not strictly better, better in every situation. So yeah, I don't think that reasoning for buffing their power holds much water. Maybe there are other reasons people can think of for doing it? Dunno, this whole thing is quite confusing for me.