Probably for the same reason there aren't any OpenSource comparables to Word, Excel, Outlook, Autocad, Quickbooks, or any other flagship productivity software
- There are several tools to read a PST file. Anyway… pst files are not commonly being shared with other people so the need to accessing it is uncommon unless you already use outlook.
- Autocad and Quickbooks are far less used (less people) than PDF.
I also wonder why there are no more tools to edit PDF files. Maybe licensing issues?
You are correct. Just because Libreoffice can mangle a docx file doesn't make them truly comparable.
emacs can edit a .sqlite file, but they aren't comparable.
The issue is the insanely massive investment needed to build and sustain a project with millions of lines of code for something that isn't particularly sexy.
