Apple moved into the space when Adobe's willingness to support the Mac faltered during the transition from classic MacOS to OSX.

Once Adobe finally committed to supporting the new platform, it wasn't as necessary anymore.

I’m referring to later things like the macpro and aperture.

Eh, Lightroom didn't exist when Apple released Aperture. OS X had been well supported for a couple years at that point, and Apple never went for Photoshop directly.

It's even weirder cause some of it was self-inflicted from making Macs very unfriendly to GPUs in various ways.