It’s really common for people to accidentally click a button twice. Yeah that’s what denouncing is for.

My favorite example of doing it wrong is a log in form: if the login button is clicked twice, the server would reject the login because the first click has already used up the one-time token so the user gets an error page.

But I think the biggest problem is that people either apply denouncing to all buttons in a UI (like turning it on within the framework they are using) or apply denouncing to nothing. So there really isn’t a culture for carefully considering which situations warrant which.

the correct action is not to debounce but instead of error page see user already logged in in previous request and continue

Don't worry, the vibe coding AIs of the future will get it just right /s