I don’t play Moira, but Bap is my main and when I’m playing him I usually heal D.va because healing her means I’m healing other people too (AoE splash and everything). Bap is great for healing tanks,
However, when I’m playing Mercy, what are the benefits of healing D.va except getting ult charge when my other teammates aren’t critical? Mercy is most of the times meant to be played as a pocket DPS and not as this Support that has to be wasting her M1 on tanks all the time. This doesn’t mean I don’t heal tanks here and there as Mercy, I do - but if I have to play Mercy and can never damage boost my DPS cuz D.va is ALWAYS critical, something is wrong.
This character is just a PITA to Support. Worst tank to Support, actually.