Pretty much this 100%. Perfect World International (CH-2005, NA-2008) and City of Heroes/Villains (NA-2004) already had more customization fresh out the gate with their body sliders, both from WoW’s generation. They were regarded as MMOs with the best customization up until Blade and Soul (KR-2012, NA-2016).
Speaking of BnS, that and BDO are the only two I’ve played that have customization deep enough to let players change the color and style of the iris, pupil, and sclera. So the eyes can be inverted, elliptical, and heterochromatic simultaneously.
My opinion of the addition of glasses that were added over the summer:
Going by PWI and CoH/CoV, the tech was always there when WoW was released, it just wasn’t utilized or just had no interest at all.