For some markets, unusable is not overstating it at all - it's literally true.
Much as I loathe Windows and increasingly dislike MacOS, there is nothing like Adobe CC or any of the major DAWs, video editing tools, or VJ performance suites on Linux. Not even close.
There are toy copy apps run as hobby coding projects. But professionals need the real deal - for file exchange and for other workflow reasons - and Linux simply does not offer that.