All of us who have Mac pro are in the same boat, the issue is we the people who use Mac pro are no longer relevant to Apple and a lot now have jumped to PC, as like you say its insane and rude they have done this. You never know Tim Cook may throw a bone later this year but dont hold your breath!
Also even if he does it will be another 3-4 years before that aso gets updated as its not a consumer item. Consumers want everything now and the latests look, we just want reliability, functionality and the best possible speed for our workflow as well as to be able to update and easy connectivity to a multitude of storage devices etc.
Apple have silently stopped supporting editors, photographers, film makers over the last few years, yes there are the odd update here or there but most have been left to wither on the vine, I mean how long does it take to update aperture for god sake and the FCPx debacle was just silly and a punch in the face.
Lets face it Adobe has the edge for digital workflow and although not perfect and doesn't have Apple on the box at least its updated regular and works perfectly with a PC. Just use it for that and that alone and keep away from the internet unless updating. This way you prevent viruses although not entirely.
So Apple you were just that, the Apple of my eye for many many years, but for pro work its sad but I have to let you go. I will still be using your MackBook for consumer rubbish tho