I'm planning leveling my 70 ret twink to 72, just because Wings would be amazing imo.
Yes, at level 70, Ret can perform well in a group setting, but in a 1v1 scenario against a resil stacked healer, it's almost impossible without the burst.
@ 70, Ret lacks Wings, GoAk, Inquisition, and their mastery. Both cooldowns are a major part of Ret burst in arena and bgs, and Inquisition+ Mastery is a huge amount of bonus holy damage.
It's up to the player, but I'm tired of not having wings.
I can only see ret going downhill since Word of Glory is getting a 20 sec CD, and we'll still have our same 70 toolbox.