I think they'd get pushback on that from users running legacy DOS/Win3.x/Win9x stuff in VMs. Most of those aren't so performance-critical that they really need

I think they'd get pushback on that from users running legacy DOS/Win3.x/Win9x stuff in VMs. Most of those aren't so performance-critical that they really need to run as VT-x guests, but Intel has had multiple run-ins with the perils of "buy our new chip because it will make your applications... uh... slower".