It's more that it's trying to catch people who've changed their names for political purposes.
People who got married and changed their name notionally didn't do so for political purposes, and are therefore excluded from having to report.
It's not that it's to provide blanket history on every candidate for research purposes. It's a catch to ferret out those who would abuse the name change process to avoid accountability. This gives the public the ability to know if that is occuring.