Why would Zhanos change that? I already told him that no one wants that... why would he weaken the champ even more?
There are millions, literally millions of things Diana struggles with and does something no one asked for... what a fool.
If you check out r/DianaMains people are begging about some changes that would make her vital in jg again.
Some E changes which is useless as hell, making her R a skillshot. Literally millions of ideas to make her vital and he goes for removal of something that makes her playable in daimon+.
If you can dodge Diana's Q, she is a minion. All high elo players can do that. No Q means you are unable to do anything.... R+Q was the only alternative way you could engage.... why would he change that?