Did you not even read past that point? Literally, the only reason why she was given her over inflated stigma is because of the nerfs Ana got around season 2-3. Ana got her healing nade damage reduced from 100 to 50. The anti heal effect was decreased by a few seconds, along with the plus healing ability. Her rifle got a 20 damage nerf. Her ultimate had its speed boost reduced.
I’m sure I’m missing some since Ana had gotten a handful more than that, but those nerfs crippled Ana. Since there were only two main healers (Mercy, Ana), everyone chose Mercy over Ana since she offered more value. After various balance updates, such as nerfs to burst and buffs to dive heroes like D.VA (Micro missiles) and Winston (Shield cooldown starts the moment you place it), Ana further feel from relevancy, making Mercy the more optimal pick.
But, since Mercy had her flaws, she was given a buff that began to start a downward spiral: Her invincibility on rez. Usually a Mercy always died after mass rezzing, a good trade off if she only manages to rez two and gets killed, putting all the pressure on a Lucio or Zenyatta to heal on point. Yet, since Mercy was being picked so often, people screeched that she was OP. Mercys only crime was existing.
So, instead of the doing the reasonable thing and buffing Ana, they decided to just completely demolish Mercy due to public outcry. Ana got buffed later on, but left Mercy in the gutter, now making Ana the only viable main healer. Only reason why people dont whine about Ana is because of the whole “skill” fetish the playerbase has been obsessing over (Even though healing as Ana isn’t as hard as people make it out to be.)
On consoles, Mercy is obviously the better choice since, no offense to them, console players aim is significantly worse than on PC. Its the only platform where Mercy can be “viable”.
Seeing a pattern here? Ana has already gotten a nerf to her kit, and its going to more than likely happen again unless Baptiste steals the spotlight.