It’s a real issue because, technical aspect aside, lots of instruments cost a lot of money and are necessary to keep up with the trend. Also theses plugins can save you a lot of time, meaning you can provide more music on short time (effect plugins are concern as well here).
Fruity Loops doesn’t have any easy equivalent on Linux. I’d say try reaper and ardour as they provide windows binaries. Be careful LMMS isn’t a FL clone, it’s midi only.
For the Arturia plugins you can install them with wine and use yabridge to make them compatible if they are not in vst compatible format (ardour can take vst2 and vst3 but sometimes it will not work). You can also have a dedicated PC for instruments (it is what I do) on windows (using audio gridder). Gotta test the Linux server version of audio gridder to see if I can go back to linux on m’y second PC. Or you can just send the midi notes to pc2 then get the audio out to pc1.
It’s doable to make proprietary plugins run on Linux but the reliability is the nightmarish part, as an update can break the wine compatibility and it can take a few mins/hours to restore.