Because I didn't realize they are there :-)
Btw., it would be quite useful if their output was standardized. E.g. LRF-META will output:
Title: An Awesome Book
While PDF-META will output:
Title : An Awesome Book
Of course I can parse it easily enough, so no big deal, just a tiny little annoyance :-)
I'll see about adding these calls to my utility and if it works, see about updating it into a releasable state.