I have run high quality music production software on Linux. It was Windows software, that runs thanks to Wine. It works and it's even better than native applications because native applications expire when a distro version is discontinued and the application is not packaged for the current version. Windows applications installed in Wine never expire. Wine is Linux, Linux does the job.

And high quality image editing is possible, though it's probably done differently from whatever you're used to. There are plenty of graphic artists making their work on Linux and bragging about it.

So "doesn't even remotely come close" is either a lie or a display of your ignorance.

Can you use iLok on Linux/wine?

I know quite a few graphic artists and musical engineers who use Linux professionally. I think the difference, really, is which tools you're used to using. There aren't really any Linux tools for these sorts of things that work the same as the tools for Windows, so if you're expert with one, you still have a rather large learning curve if you want to use the other. That can be prohibitive.

Both these things are very well possible on Linux. Maybe you are more concerned about specific applications which have not been ported by their developers?