The software is stable and I've used it professionally to track bands in a real studio for years - right alongside full-blown ProTools, REAPER, and now Luna sys

The software is stable and I've used it professionally to track bands in a real studio for years - right alongside full-blown ProTools, REAPER, and now Luna systems, which have just as much failings as you seem to think would preclude professional use. In fact the Linux DAW has saved my ass a few times - most recently with the catastrophe of Catalina nuking entire suites of apps and plugins that were needed for production. FL Studio under wine: pro's can use it. Just because you don't like the technology doesn't mean its not professional - you just haven't bothered to get competent at it. As is demonstrated time and again in the pro audio world: its not the instrument, its the artist. Ubuntu Studio is great for artists and anyone wanting to learn pro techniques, whether they are fashionable or otherwise, would be wise to give it a go - in spite of the naysayers who have gained no production experience with the tool because of their own prejudices...