Why replace it tho? Its like literally in the design of Mercy herself and the intro to her.
“Mercy’s Valkyrie Suit helps keep her close to teammates like a guardian angel; healing, resurrecting or strengthening them with the beams emanating from her Caduceus Staff.”
Mercy is literally designed after an angel, her name being Angela as well, not important but you get the emphasis on angel. Doesnt seem out of place if you ask me.
She wasnt a nightmare to balance pre-rework. Just sayin. She had the highest healing output, mobile and was able to ressurect a team instead of just one. Yet wasnt complained as much and wasnt even meta at the time.
It was only AFTER the rework she became a problem.