You're completely missing the point. It's fine for amateur, non-live, non-critical work. But just because it works for you, it doesn't mean the software is stable. Hell, KDE itself (at least the kubuntu version) is not very stable so I doubt this version of ubuntu studio will be either. And suggesting to run VSTs on an unsupported OS or FL Studio under wine is likewise fine for amateur, non-live performance mode. For everything else, it's tempting fate especially when your desktop environment crashes when displaying the desktop number after switching desktops (one of many, many issues that cause kde to crash, lock up etc.).
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...
