As an electrical engineer that wrote more than 5 different denouncing implementations: You are of course correct about denouncing, yet most buttons wouldn't nee

As an electrical engineer that wrote more than 5 different denouncing implementations: You are of course correct about denouncing, yet most buttons wouldn't need more than 25ms denouncing, which is a magnitude less. Denouncing user input in UIs is indeed something you should do. Especially if it would be bad if the user input ends up triggering something twice.