I really don't see SE adding support for another API for such a tiny percentage of players. They can barely support DX 11 and honestly I'd rather see some DX 12 action instead to reduce cpu overhead (Not that XIV is very CPU intensive). From what I've seen the M1 GPU is somewhere around a GTX1050/1050ti range when running on Metal, not bad for integrated but nothing spectacular. I'd be curious to see how a 1050ti equipped Win10 machine compares to an M1 Mac in the benchmark actually, just for fun.