[treis]

Because an occasional glitch when the client & server sync back up is acceptable in a game. Finding out that my order didn't actually go through is much worse. Especially since click button, see success, and close browser is an relatively common use case.

[yencabulator]

Consider these two scenarios.

1. SPA with asynchronous server communication. A button switches to a spinner the moment you click it, and spins until the update is safe at the server. Error messages can show up near the button, or in a toast.

2. LiveView where updates go via the server. The button shows no change (after recovering from submit "bounce" animation) until a response from the server has come back to you. To do anything better, you need to write it yourself, and now you're back in SPA world again.

There's a reason textarea input isn't sent to a server with the server updating the visible contents! Same thing applies to all aspects of the UX.

EDIT: https://dockyard.com/blogs/optimizing-user-experience-with-l... talks about this. That'll handle things like buttons being disabled while a request is in flight, but it won't e.g. immediately add new TODO items to the classic TODO list example.

[strken]

That's a deliberate UI choice, though, and it doesn't always make sense in non-transactional workflows. It's easy to wait for Google Docs to say "Saved to Drive", and going to a new page to save a document would be really disruptive to your workflow, for example.