So what if people sell platinum and gold plans for gil?

[Valarian]

People could make gil in lots of different ways before. If you wanted to invest time in crafting, selling DF runs, gathering, desynth, etc.

But now, you could potentially just make a ton of in game money using RL money instead. A bit disheartening.

People wanted in game way to buy those weddings with gil through SE, not through other players as a middle-man.

I think, though, that economically this is a good thing. That gil moves from someone who had been hoarding it to someone who's itching to spend it. Once spent, that money will either curb inflation when it is eliminated from the economy (NPCs, Housing), or it will fatten the pockets of another player who's trying to make money to buy something (Market board), and curb inflation (Money eliminated because of market board taxes).