@legoktm poking at the very extreme cases, it looks like these are also picking up heavy use of text in notes or in tables - which I guess is unusual enough not to skew things too much by comparison to reference markup. Least "efficient" is https://en.m.wikipedia.org/wiki/Maya_stelae which definitely goes all-in on the table approach!
The tool sounds fun - will have a think about how it could be used.