It would be harder to find out the relative effects of various filters: no children, children don't reproduce, grandchildren don't reproduce, etc.

Yes, you'd need much more detailed genealogical information. There's tons of modern genealogies, of course, but how useful are those outside the modern era?

Since I didn't realize Baumeister had written a book, I did a few word searches (including in google scholar) and didn't turn anything up.

His book was the second sentence in the page. :)