Nerf/Balance Idea for Yasuo

What about letting him use his ultimate on knocked up enemies only? Which means he would still be able to ult with Janna's and Alistair's Q, Blitz's E, Malphite Ult (...)but no longer on Alistair's E, Janna's Ult, Thresh's E(...)

It would significantly reduce his window of action since he can ult every enemies that is moved with an ally ability...