Oh we already have Macs - they’re used by the flaky types in the art department.
The new version of Photoshop sgnificantly reduces art flaking.
As one of the flaky types in the “art” department (who by the way probably makes more money than you do) the reason “why ‘no Macs’ is no longer a defensible IT strategy” is because it was NEVER defensible.
The usual argument is “security.” True enough. IT fears Macs because we don’t need them the way PC users do.