Genuinely interested: how would it be more usable if the buttons remained clickable after they'd been clicked? If you lost your connection, wouldn't you expect some kind of error? In that case how would it be more usable to be able to click the button again?
if I lose connection and the form is unresponsive I have to f5. often forms have some custom js selectors and after refresh some elements (or even whole formsets) lose their data.
of course an error would be nice, but the main goal is to submit the form I spent the last minutes filling in.
