Most players don't know about Mods. I know they exist and I don't care, and that's how it should be if there is a small extra option in this game. Turn off glamours. No big deal.
I remember the first time I went into the Troja Dungeon for the MSQ... 1 female Miqo'te in a bikini, 1 male Au'Ra half naked with Summer's Flame pareo and nothing else.
It ruined my entire experience / immersion in that dungeon at that point in the story.
Is it fair to other players, to ruin their game with ugly Glamour? I don't think so. I see it even as a Win / Win situation. Everyone wears what they always wear and some off us just turns it off and see others in normal Armor.
Oh and to those who writes that it is unfair to hide their Glam, no it is not.