[Somewhat depends on Bug 318998] Okular should ship a Service Menu that contains a "Print" entry, so you can easily and quickly print certain PDF (and/or other document) files. Reproducible: Always
To be honest don't see why we should and say calligra not or kate, etc. If you want a feature like this it should probably be handled at the workspace level, have a daemon with "desktop-file-plugins" so you can print "anything" Of course that'll never happen unless someone does the work