i write open source code primarily for myself. doing anything i dont consider critical takes the joy out of doing it.
if people want features, they can fork and contribute code and then maintain that code, too...forever. of course, once you shift that burden to them, suddenly no one wants to get involved.
sorry for putting it this bluntly but it's the truth. i am one human, with a 9-5 and a life outside of coding. people seem to feel entitled to opinions on free open-source projects having contributed little-to-nothing.
i typically add them (or update the docs) once users encounter problems and open Github issues (reactively). doing it proactively is a waste of time (for me).
i accept the criticism. i just don't have the necessary free cycles to address it.
Keras is great about error message[1] and it's part of what makes Keras beloved (and heavily contributed to).
[1] https://blog.keras.io/user-experience-design-for-apis.html