That said,
> Partial submissions
> Collect answers from people who filled in a part of your form, but didn’t click the submit button. Capture data from lost leads, find drop off points and improve your conversion rates.
From a user point of view, I really hate this. I’d say collecting data about drop off points is fine, but secretly collecting answers not intended for submission is a dark pattern that violates an implicit social contract and users’ privacy. Hell, people often accidentally paste in private stuff, including passwords.
I can understand that as a form builder product you probably need to offer this feature or lose customers. Add this to the long list of depressing “features” of the modern web.