Sometimes it's not worth having the latest, greatest OS release for DAW purposes. Hardware / software updates usually take awhile to catch up if revisions are required...some mfrs are dead slow with driver updates.
I like to stay one major OS release behind for DAW use. I stuck with XP well into the Win7 era. I've very recently switched to Win7X64, now that Win8 is becoming established. The issue of incompatible drivers, etc. is all but removed from the equation. Who want's to deal with that annoyance? Not me, that's for sure.