Even if they were fast enough you would still want to launch those chips on less performance critical machines first and give the pro apps plenty of time to upd

Even if they were fast enough you would still want to launch those chips on less performance critical machines first and give the pro apps plenty of time to update before migrating the pro hardware. Usually consumer software moves faster to adopt new tech stacks anyway. OS X supported x86-64 in v10.5 in 2007, but Photoshop didn’t go 64-bit on Mac until 2010 with CS5. My best guess is that it’s because big pro applications have a mess of dependencies and some inner guts in the high performance code where it drops to assembly. Building that for alternate architectures isn’t as simple as checking a box in Xcode.