Both.
But not to development.
Non-the-less.
Stability of software doesn’t only means that software doesn’t crash.
Stability of UI.
Stability of developers API.
Stability of performance.
If you guys don’t understand it so be it. Non-the-less. Those (and others) all mean that software is stable or not.
It does. You simply are using very narrow meaning of the term. But the term is not constraint to software crashes only.