@ Bruno Girin
"Saving as PDF gimmicky? I beg to differ: I use it all the time for documents for which I am the only author but that I want customers to be able to open. Invoices for instance are a typical use case: I create they invoice, they read it (and hopefully pay me), PDF is ideal for that sort of use cases and LibreOffice produces flawless output."
PDF output is not entirely without use, I agree. The example you give is a quite poor one though. PDF is widely used for quotations and invoices only because of the need to some bureaucracies to keep a paper copy of everything (which, in _some_ cases, makes sense), AND he common misconception that PDF cannot be tampered with. In hard technical facts an "informal" GPG/PGP or MIME- signed (optionally, encrypted using the same techniques, if confidentiality is an issue) pure-text email is much more secure and much, much smaller than any PDF.
Moreover, when collaboration is limited or absent and PDF output is wanted, non-WYSIWYG systems are far more reliable than so-called "office" suites. I'm thinking LaTeX of course, but also lout (which I use the most these days as it produces flawless PS, is extremely small, and extremely easy to script, extend, or otherwise customize).
Saving as PDF is useful for presentations and/or brochures that are not to be printed. But again, it is far from flawless, as the PDF format is remarquably vague, so it sometimes happen that you get PDF documents with embedded graphics that just cannot be displayed on a regular computer because of silly DPI specifications (usually more of a problem with printing than with viewing, some printers have little memory). More often even, you get PDFs writen in a combination of exotic fonts (as text, not as graphics), but DO NOT include any info about the fonts used besides the name, so every other character looks like a comic strip insult when viewed on any machine but the one it was created on. Very practical, I can tell you.
PS, yes. PDF, just asking for trouble in the hands of the clueless masses. Although LO's (and before that, OOo's) default PDF output is quite near to flawless, as noted above by someone else.
Therefore, I maintain that PDF output in an "office" WYSIWYG suite is mostly gimmicky. But still nice to have.