It will be a good practice to use modern <button type="submit"></button> html semantics instead of <input type="submit"/> in all frontend forms.
The main reason that WP themes will have more control to customize <button> elements via CSS. It’s possible add inner HTML content (<span>, <strong> or even <img>), and make use of :after and :before pseudo-elements to achieve complex rendering while <input> only accepts a text value attribute.
At the moment Gravity buttons are presented by <input type="submit">, this is really outdated in 2020.
Hello @myph - thank you for the suggestion. I just checked the 2.5 beta release and it’s still an input there, not a button. If you would like to suggest that for inclusion in the future, I recommend adding that to our product roadmap. Click the blue in the lower left on this page to add a note for our product team: