I saw one other post about this so I'll link it below.
Is it possible to add an annual subscription option?
I have been playing since ARR Beta and in that time, my kids have joined me in playing. I honestly would rather pay one big chunk once a year for all three of us, than have to manage it monthly. I know there's the 180 days option, but once a year makes more sense to me.
https://forum.square-enix.com/ffxiv/...on#post5307093