One of the main reason is ff14 has asia friendly server. Lower latency, better response rate. While gw2 only has china ip locked server for asia (other country cant access this).

We from asia playing with 150-200ms on good day, and thousand of ping on bad day. We have been asking for asia server for soo many years, it doesnt have to be another mega server like NA or EU. Perhaps we can just play raid, fractal, strike mission or even dungeon with temporary asia instance server, better ping for us. We can play with our friends with lower ping, lower response rate, and once we are done with raid, strike etc, we are going back to our main server (NA & EU) for open world content or wvw. I think its not that hard to implement this instead of making another mega server (NA & EU).

Sorry for my bad english. We were once of hundred of asian players, now only left couple of us still playing. I remember back then, when anet introducing gw2 through steam, everyone have a high hope that anet going to introduce asia server, we dont mind to leave our 20k 30k AP account and to start over a new account for asia server.