A good chunk is. There is also a lot of legacy 32 bit code and industry specific tools which are getting left behind. Plus a lot (most?) of Pro tools and games

A good chunk is. There is also a lot of legacy 32 bit code and industry specific tools which are getting left behind. Plus a lot (most?) of Pro tools and games use C++ or something a bit lower level. I know Adobe is dragging their feet supporting Windows ARM and there is very little gaming support for it either. Both Adobe and Unity have announced "Apple Silicon" ports, Adobe has been dragging their feet on Windows ARM support and I don't even think Unity has announced they will migrate to Windows ARM.