I mean... If there is anything to copy from GW2 it would be the near perfect inventory and vanity system it has.
And probably their amazing idea of releasing overworld map with each patch release, full of content and challenges, that aside raids or other instances. XIV is wayyyy too instanced, we need more thematically sound and challenging overworld content.
For example, Stormblood had the chance to really dig atmosphere and thematically interesting ideas on its map, instead, it gave us generic everything once more, look at the lochs. The whole map should be whole dedicated to military operations and skirmishes between rebels, alliance and empire, instead... You just a few of those and the rest is just randomly wandering enemies that have no reason to be on a "warzone"... GW2 just nails every map, with a main theme clear to the storyline and world events, the way the near seamlessly transition from instances to open world content on the same map, is just amazing. But i guess FFXIV netcode is just THAT terrible that none of those two ideas would even be possible.
Like, it wasn't for the lore i know, the lochs is probably one of the most calm and serene maps of all... And it should be a literally war torn land, with armies fighting, sieges going on, fire falling from the sky and very tonally serious and long FATE missions like military operations that go from start to finish culminating on maybe, the pushback of imperial forces and then, maybe a few minutes of calm and peace for the rest of the exploration, like, is the one map that must had been full of imperial units everywhere... Instead you fighting sprites, skeletons and... salt bugs? Really.
