XI the least played Final Fantasy game, and the one that got to be a main sequence number by chance and luck, which is the only reason it's still maintained, and will be as long as Square Enix is an independent game developer.
Nothing in 14 breaks immersion, as the setting has Space Ships and Computers. Modern Fashion has always been a part of the setting.
Have you seen female Miqo'te starter clothing. It's club wear from the 80s. 14 has always had modern fashion as a part of the setting, you face off against space ships and mechs rather quickly in the story. We literally collect Cell Phones to use as currency for old tier sets. And use bluetooth ear pods for global chat.