I can understand this, sadly we can only hope for blizz to know more than what they give out
That being said, I would like it if you checked out my proposed changes to Mercy that I made on the workshop:
https://us.forums.blizzard.com/en/overwatch/t/mercy-4-0-by-hige
Since I made it with the mindset of giving mercy the option of increasing her sustained healing on a single target briefly and also giving her burst healing upon casting valk, I think this is the perfect middle ground for everyone on these discussions, those who want mass rez and those who dont, those who want mercy buffed and those who don’t, she plays almost the same but has these added things that makes her so much more dynamic which also targets those who find her boring and those who like her current playstyle…