Genuinely speaking, are there UX/UI/CHI innovations about developing software on small screens? I think it go both ways: it is not only about the form-factor but rather programming languages and UIs specifically adapted. For example, it is not the same to develop in C++ that using Python or LISP.
Something like uiua [0] could be workable, especially with the virtual keyboard. I can probably see images based environments (common lisp, smalltalk) wokring too due to the interactive nature of live programming.
