“Dealing damage with Biotic Orb now restores a small amount of Biotic Energy,” notes the Moira update in Overwatch 2’s January 5 patch. The key point is that this encourages players to utilise the harmful Biotic Orb rather than the healing Biotic Orb. Giving Moira players extra Biotic Energy for healing, in other words, does not cause them to heal. If the argument is that Moiras doesn’t heal quickly enough, it’s a fair point.
There is a perspective on the circumstance where this is the right choice, which is to Blizzard’s credit. If Blizzard notices that Moira players nearly often use the harmful Biotic Orb and that Moira players frequently do not heal due to a shortage of Biotic Energy, then this modification works flawlessly. Moira’s damage isn’t increased since they’re already spamming damaging Biotic Orbs, and it allows them Biotic Energy to heal more without pushing them to.
