For text fields in forms, allow the form builder to turn on "password-style display" option so that the field appears as asterisks ("*****") when input (with an option to display the text for verification). The field could display as such in backend views as well.

We have a use-case where multiple people should complete a form together, but they need to provide a unique identifying code that should not be shared with the rest of the people completing the form. Super-unique use-case, we know, but a use-case nonetheless.

Another great use-case would be in building dashboards or views that need to be password protected and allowing users to provide their own password via a form.