As far as mounts go I think the only two times Im aware of them refering to mounts they changed their minds on was a Red 13 mount (FF7) and cloud's bike. The Red 13 mount they felt wouldn't be a good callout to the earlier FF game because Red 13 was supposed to be an almost extinct species and having heaps of versions of him running around wouldn't work. As for the bike, they felt it didn't fit the current themes of FF14 and felt too out of place plus it felt really slow for a bike going at normal mount speed.

As for glamour I'm of too minds. On the one hand I don't really see how opening things up would really hurt. On the other hand I kind of cant help but feel it would have a negative impact on the aesthetic sense to the game. It would erode the sense of 'this is what a spellcaster looks like' or 'this is what a rogue/ninja looks like', etc. Can you imagine a NIN in some of those really heavy plate sets? I would also add that its only low level DoM gear that can actually be glamoured by DoW. Anything 50 or above is DoM only.