Not necessarily. Many media editing apps use OpenCL to speed up processing. I know Capture One uses OpenCL, and I think Adobe's Lightroom and Photoshop use it also. At this point even Pixelmator and less well known alternatives use OpenCL, too.

Sadly, most companies won't have any choice but to port their app to Apple's proprietary APIs. It's really a net loss for consumers because most of these devs have better things to spend their time on than Apple breaking compatibility on a whim.