Hardly “useless”. If you’ve got the aim to consistently swallow a damage orb with D’Va, that’s impressive. Her matrix is so small that to be able to do that, you have to pretty much ONLY be doing that. Watching for the orbs and getting into position to be able to throw the matrix up. If she’s aiming for your Orisa that is on the other side of the building, you’re going to what, booster in and matrix it away? Heck, all she has to do is throw it a little above your head and you can’t get it without wasting a rocket boost.