With how this community is it is 100% safe that this would only nurture toxicity in large parts of the content. Some weirdos would probably even start gatekeeping ARR dungeons just so they can feel superior about their damage numbers.
As a personal thing in ex/savage/ultimate it might have some sort of usage but on the rest? I simply do not trust this community to be considerate with something like this at all, especially those who have an unhealthy obsession with these numbers. Just look at the forum and how people are being treated with "git gud" and "skill issue" by simply asking for accessibility features.