I'm just setting up a frontend profile form and the default size for the heading field is too small - ideally it should be an h3, both for physical size in my theme and semantically as the previous header level on the front-end is h2.
I know this will be fairly low priority for you, but just wanted to flag it as a nice-to-have.
There isn't an option to change the heading tag h4 to another one. You can add a custom CSS class to the field setting and increase the font size of the custom class. Pleass check this screenshot https://imgur.com/JrKDghr
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