It's like everything and anything, we all have to move on to better things, new technologies come out all the time, this is why it's probably not supportive on Mac cause they are moving on with the times and Vulcan (the new openGl).
Same as Microsoft, windows, how many of us still use windows 98 or even 7 - it's certainly not supportive to Microsoft's Windows updates. Think of it like that. TGC doing the same thing with their software.
I know it can be difficult for many of us moving from an IDE pure code to the studio style. Without seeing it to the full. I'm sure it is backward compatible to compile our classic code but has the vulkan support plus other features. like faster running of commands.
Just frustrating to have all the additional visible features which would annoy me but won't be disheartened to at least give it a try
TGC has probably decided it's time to move on like the rest of the big software companies. They probably don't talk about their plans cause they may not feel it's necessary to do so. News travels fast and competition can be fierce if news gets into the wrong hands.
My thoughts anyway