Certain types of automation and testing are often built on top of accessibility features. Accessibility doesn't just mean accessible to the disabled. It also means accessible to your code.

Exactly. And people forget that depending on the UI libraries you use, you might get a mostly accessible app by default. All of core Windows widget classes, and WinForms and WFP, support accessibility features. Worst case you have a somewhat broken object tree without good labels, but that's already a start.

Dealing with something that believed it only needs a canvas to draw on is PITA.

> Not that many people need accessibility.

100% will require accessibility in some form if your timeframe is long enough. We aren't young forever, you know.