Thanks for projecting your opinion, but I’m going to have to disagree with you there. Has Mercy been reverted to have Mass Rez? Is Mass Rez incorporated in her ultimate in any shape or form? If the answer to that is “no”, then you have answered your own question. I will continue to post my feedback on Mercy’s current state, and I will continue to vouch for more reverts. I appreciate the suggestion though! 
And if the man in charge makes statements on things like “deathmatch not coming back”, only to end up announcing deathmatch, and how Brigitte is meant to be “able to counter dive” only to make changes that makes her weak to said Dive comps, I’m pretty sure it’s apparent that they are more than willing to change their minds.
I’m open to these as well. In fact, I think the idea of building rez charges is a great one, and have made various suggestions regarding the idea myself in other threads as well, that allude to this. Nonetheless, great alternate suggestions, I must say and would love to see these ideas in action. 
~Sincerely Yours xoxo,
a Lover of True, Fair, and Fun Balance.
xavvypls 