Why Riot may have refused to fix GGMF
I think this is exactly why Riot refused to make changes to the skin. They already had most of this animated trailer done and would have had to waste a lot of money having it updated to reflect the model's changes. It looks like they solidified their decision on what the skin was going to look like way before they showed us and already went through with Splash Art creation, promotion, and the like before bringing it to PBE. It's a similar case when they make lore changes that people dislike. They decide on one vision and immediately have people work on all the other related graphics to the point where going back isn't a viable option anymore.