To lower the threshold for users to submit their feedback, an option to make the email address unrequired would be a useful addition to the Feedback Module.
When enabling this option, I think that development teams will receive more (and more diverse) feedback because users would be less reluctant submiting their feedback.
In addition, the default tooltip text in the module already states that it is optional to fill in your email address. But in practice, it is still impossible to submit feedback when leaving the email address field empty.