The problem with most generated documents is that they can look... generated.
They tend to have lots of empty headings, missing data and generally are hard to read.
If you have formatted your content in tables, any ‘missing’ data will show up as cells containing blanks. The space impact of printing blank fields is not too significant, although large numbers of blanks may mask the ‘real’ data.
But if you have formatted in-line, then there can be a series of headings with no data underneath – for large models or large numbers of elements this can easily fill many pages.