If I carried operas around in my imagination and had no success in getting them produced I wonder what I might do with them?
Judging from my experience of creativity it will out. If the world does not offer an outlet I will make one, like a watercourse continually bowing and swerving to account for natural obstacles on its way to the sea.
Perhaps as he got "older" -- remember he died at 31 -- Schubert took it upon himself to be and make his own opera all by himself. Thus the late sonatas are perhaps not so much sonatas as some hybrid creature that we have not previously encountered. Imagine! A new species.