I picked too short, bogged down by details, works too derivative and writing idiomatically.
Two of those I'd not consider actual weaknesses, but other people I guess do so I checked them.
However, there is one which I'd say is not on your list, but is a big problem for me: Technology
I really hate working with samples and MIDI, but I hate awful-sounding mockups worse.
Unfortunately though, virtual instruments have largely stagnated, and in order to get a good sounding mockup, you often have to sacrifice ideas in favor of what the samples can do, and there is a lot they cannot do.
I hope they continue to push the limits with things like Musesounds and Staffpad so that we can all be free of the wicked chains of Kontakt and stitching together note-by-note recordings like a bunch of savages. Creating virtual renditions of romantic-style, or golden-age hollywood stuff is such a soul-crushing endeavor that it makes one yearn for the sweet release of death — or just giving up on music entirely.
Hey, maybe AI will be able to make the mockups for us