That point aside, It's not just a uniform, it's functional equipment. To be functional, there needs to be choice, otherwise you're trying to squeeze every body type, income bracket and preference into the one slot (or however many variations there will be on this mandatory gi).
If you look at football/soccer players, how many different shapes, brands and models of football boots do you see them wear? They all have different preferences (and sponsorships of course, at the higher levels). Even Manchester United wouldn't insist that all their players wore the exact same boots. I see a BJJ gi as comparable.