They've supported macOS through all of PowerPC, Intel, and now ARM. I'm sure Windows on ARM should be trivial for them.

They did the work your parent comment describes for macOS on PowerPC, macOS on Intel, and macOS on arm. They can do the work, but it's still work.

	▲	jajuuka 11 hours ago \| parent [-]
		I think it also depends on urgency. When Apple unveiled Intel and Apple Silicon they were very clearly the future of the platforms with large buy in from day 1. Blizzard seems to have a good relationship with Apple since they released the Apple Silicon version of WoW almost the day the first laptops started shipping to customers. Windows on ARM isn't really the same ballpark. They were still there early, but the platform is still changing quite a bit.