1) Not even remotely possible. When you change a cowl to look like a robe you are still getting the full stat boosts from something that takes two slots. What would be ridiculous is letting someone get all of those stats plus the benefit of an added head piece they otherwise wouldn't be able to wear. Unless you're expecting SE to release an entire line of statless gear and a change how said gear is equipped just to benefit people that happen to wear cowls.

2) It's the "Glamour" system and it uses Mirage Crystals. I seriously do not understand how people still do not understand it considering this complaint has been around since they first mentioned the system. Glamour is the perfect name for this system because not only does it reference making something more attractive but has a secondary definition of being a magical enchantment.

3) How exactly did you forget you were making a list of 3 things after your first point...