Dont be disingenuous. The argument for years has been, "The Sunwell has been restored. It has both arcane and holy magic, therefore Blood Elves should have gold and blue eyes to represent holy and arcane magic." Nowhere have I seen anyone ask for purple eyes for Blood Elves. The goalpost shifted, but the reasoning did not. Its about taking colors exclusive to High Elf NPCs, so Blood Elves can pretend to be 100% High Elves.
Only High Elves can have blue eyes. Give it to us.
After the update: Only High Elves can have purple eyes. Give it to us.
If High Elves were updated with hypnotoad eyes, Blood Elf players would demand to have those too, because "We're pure high elves. Psychedelic eyes are just another arcane color!" In an old game with graphic limitations, NPCs having exclusive attributes is important to separate them from players. Cult of the Damned humans have face paint or tattoos to identify them to a specific group, even though technically any human would be able to wear those markings.
But lets be honest. This kind of disingenuous argument is the reason why this thread is a million pages. That's why I said this opens up another can of worms. If "le Sunwell" is the reason to give Blood Elves every eye color available, then Void Elves should have access to Blood Elf hair colors and eye colors too.
Void Elves having red eyes is me returning the spite. If Blood Elf players want all of the appearances of Void Elves and High Elves and just claim "its Arcane magic", then I can claim that red eyes can represent Void magic, as red is a common eye color beyond Dark Rangers.