I've been in photography for 4 decades so bear with my ignorance
Adobe had its own Mercury Engine that is more efficient than OpenGL. It supports a few OpenCL features. It isn't accelerated by CUDA.
I also confirm what others have said about 10 bit output. Barely anyone ever needs it, perhaps only half a percent of global photography has required it because most imagery (almost everything) doesn't have a colour palette anywhere close to what 10 bit can provide.
We have to bear in mind that most publishing has been done on a Mac and only a handful of AMD GPUs supported 10 bit output starting on El Capitan.
The advent of HDR video content will speed adoption.
Here's what the platforms provide:
- Nvidia settings offer 8 and 10 bit output on Windows, even on consumer cards three years old.
- Nvidia doesn't offer 10 bit output on the Mac.
- A small selection of AMD cards offer 10 bit output on the Mac. Most recent cards support it.
- AMD's 10 bit output option doesn't show in Windows so I presume it switches automatically.