This means you can have multiple people digitally sign or even fill it out, then they can sign the text representation which is easier than a digitally signed PDF or json. You need this because when you update the backend and frontend between logins and there is always somekind of mismatch that will happen. This is especially hard when you have non linear form entries or optional parts like the C/O part in this form, there is always something that slips through the crack in regression testing.
Last time it happend to us someone had upgraded the front end calendar month chooser. It was well tested, but that ment another optional date picker was updated and testing did not happen there. Then organizational and technical Murphys law struck meaning complete data loss for people affected by that.