I admit: my complaints are likely a side effect of being a niche user. I don’t think people curating their own collection of 60,000+ tracks is a use case they worry about.
The only reason I use it is I depend on iTunes Match to make my music available on all of my devices. That’s the one thing it does do seamlessly. The collection is too big to copy to all devices, and some devices require streaming anyways. I have searched everywhere and have never found a viable alternative. I can find alternatives for parts of my use case, but not everything. So I’m stuck with this software..
I have this dream that one day I’ll have the patience to figure out how to write my own GUI for it, but I’ve given up every time I wade into the apple developer docs. I’d pay good money to someone to stub out an app for me so I don’t have to figure it out from scratch, and go from there.