Okay so this idea just came to me, and if this has already been said I apologize.
Okay so we know expansions will be coming, for this one lets say we are going to cantha, now if they let all the races come over, what incentive would there be for any race to go there besides humans? My answer is simple and brings up base knowledge about warfare, take for instance a sword, while a simple weapon it has been used across many different cultures with many techniques, while the arena net team has done this with every profession why would the canthan Warriors know the same ways to use a sword as their tyrian cousins.
So why not have characters learn new weapon skills for the same weapons they already have? Like give us a way to choose from the 1-5 weapon skills that is not all the same so when two greatsword warriors meet in combat they aren’t just constantly flailing at each other, and so that skill progress from gw can come back which made me fall in love with the first game.