Really begs the question why you're doing audio production on an iPad, and other than the audio jack and its relevance to that razor-thin edge case, why the lack of a home button or a fully fledged Finder is a dealbreaker.
I think the reason is basically a big touchscreen. Music production (and performance, of electronic genres) benefits from having lots of hands-on control, and without spending an absolute fortune, you basically have two main routes to go down: a mappable hardware controller that doesn't display what the controls are currently mapped to do, and doesn't reflect the current parameter values, or a touch screen with controls that are virtual but don't have those other limitations. Still, you can set something up where the iPad is just the controller, and you do the real work on a laptop or even with hardware instruments, where the other shortcomings of the ipadOS experience don't matter.
