That's rather odd you say this because i totally agree with you that users don't want to be aware of the UI and that is exactly why there is no tools everywhere one the screen like other softwares, so you can focus entirely on your artwork.

We made the choice of innovating in almost every aspect of this software (tools, UI, Design) and took some bold decisions that indeed the most conservative users might be not understand. We are not named Psykopaint to do things the old-fashion way.