ill have to have a look for the adobe blog thing about it, CUDA is not dead but is being fazed out from adobe.
there's an adobe blog article some where listing what is accelerated (not much) by the gpu and which things need CUDA/openCL (openCL did most things that CUDA did if not all now).
there are some plugins that do need CUDA but if you had them you know already.
AE has replaced a lot of it's CUDA accelerated parts with cinema 4D in CC
CUDA only did a few specialist parts of work
Not sure about Adobe fasing out CUDA, but they have taken an active role with using OpenCL. I've read the same Adobe blog. There is only 4 things that are not accelerated with Radeon cards than GeForce in Premiere Pro. Lightroom also uses Radeon Acceleration ( Depending on supported cards ) It works good with my D700's.
investing in FCP-X workflows is playing with fire.
Its use is tied to macOS and Apple isn't interested in making workstations anymore.
Its more like I'm on fire ( Speed ) using my FCP X workflow for over a year now. I've tried PC workstation with Adobe PP, Lightworks ect. But FCP X is my NLE of choice and it serves me extremely well.
Yes Davinci Resolve uses and prefers CUDA.
A lot has changed. On my 2013 Mac Pro DaVinci Resolve uses BOTH my D700 GPU's with the free version. It quite fast for me in DaVinci.