I’ve mostly heard it from musicians on various distro forums and such for some reason. You’re right, there’s JACK, and low latency versions of kernels and all sorts of other stuff. (LMMS is more than fine for my experience level lol)

Mainly I think it’s because a lot of the fancy paid DAWs or plugins boil down to Windows, but I’m not an experienced musician myself to really know what their exact complaints are.

I think it still might just be FUD generated by frustrated people, because sometimes you gotta do a little more than “unzip and run” for a lot of plugins.