I think something needed to be done with her, but I don’t think a nerf was it.
She already lacked a mid-fight presence and lost her end-fight presence with the rework.
In all honesty she needs a rework since they nearly took everything out of her rework and just sorta left a not fully empty shell.
I find Valk to be as much (or in some cases) more reactionary than Mass Rez and I never even played Mercy with Rez.
I just used Valk to heal up after a fight and sometimes I didn’t even need it then.