I have only used iText for examining and filling the fields, but reputedly it can do lots of stuff, including generating pdf documents from scratch. So why don’t we see “poor man’s Acrobat” type of pdf editors being built on top of that?
Searching for pdf open office seems to return references to converting pdf to some other format and then converting that format back to pdf. But I don’t see references for editing pdf itself, natively.
Does nobody, including governments that reputedly have plenty of pdfs floating around, care?