They haven’t technically been ignored, no.
However their concerns have not been addressed in the slightest. After the rework actually dropped I do not think I have seen a single person complain about Mercy being underpowered or too weak. However even when she was an OP must pick, you had people complaining about how she wasn’t fun, how she was a chore to play and so on.
How has Blizzard responded in nearly every case?
Continuing the discussion from [Feedback Thread Continued Part III] Mercy Updates - Jan 30, 2018:
With stats. With how viable she is. No one was complaining about that.
When someone responds to something you said with a statement that makes literally zero sense in the context of the conversation… generally people will make the assumption that the person did not hear you or did not understand you. At that point most people will then say it again in different words or say it again louder.
Which is generally what has happened… and has been happening for 1.5 years.
This Mercy Raid was 100% people saying it again louder. Or at least attempting to.