I think this way too fundamental a thing to change.
If something has been in the 3DS version's tips all this time, and now the Wii U version has the opposite, that's silly. Yes, the 3DS tip will likely be patched, but this shouldn't have been changed to begin with.
I'm not sure if many people know this, and maybe I've been messing up, but if you pummel/throw Rosalina, Luma can only do his F-Air. Before and after those, he can do whatever, but during those animations, only his F-Air would do anything. This was an easy way to avoid getting hit by Luma when you grabbed Rosalina. There was a definitive strategy to avoiding it (among other things, like certain throws hitting Luma with Rosalina, like Mario's Back Throw). So why they are removing Luma's ability to attack at all is beyond me.
Rosalina is literally the only character they are making fundamental changes to. Other characters getting nerfs is more fixing straight up glitches, like Wario's vectoring or Item Toss Cancel. Yet they are changing how Rosalina fundamentally plays.
I was alright with increasing Luma's respawn time. It's subtle, doesn't effect you if you are really skilled with Rosalina (which means getting good with her is rewarding), but also rewards players for being good at taking out Luma. This, however, is straight up changing a fundamental part of a character's design, and is completely unwarranted.