Mementos were already dumb when they first came out. Imagine clamoring for a single-use Shader that you can't even put on armor. At least the old Shader system, which worked like Mementos do, could be put on armor. We eventually got them to make Shaders infinite use just for them to bring them back in spirit with Mementos like that's some kind of prize. And now with all the gear overhauls, Mementos were made even more useless. Good riddance to bad rubbish, I say.