I agree that it is more subtle than other changes that I pointed out in
my thread on Eyes and Au ra Limbal Rings, especially if you don't play as a M'iqote so you are not as familiar with their faces as someone who does, but I think it would also help people who are unconvinced by the OP to consider how this would affect NPCs like Y'shtola, since the model uses the same face.
I can imagine that her eyes will receive a special treatment (at least post ARR), but I think her default expression would soften quite a lot with the changes around the mouth and the cheeks, and that doesn't really suit her character.
And even for a normal M'iqote, the more "realistic" irises kind of take away from the feline image to me, ironically enough. Because they're more overshadowed and the color slightly tuned down, the gaze looks less fierce and wild than it does at the moment, even with the same pupil.