It's never been really solid in my experience; it crashes when it fails and its difficult to build due to the heavy use of cython. See, for example how kivy ha

It's never been really solid in my experience; it crashes when it fails and its difficult to build due to the heavy use of cython. See, for example how kivy has moved away from using it as a backend https://github.com/kivy/kivy/issues/5590 https://github.com/kivy/kivy/issues/5590