Sometimes I don’t know if I have a piece of information as block or as page. With ctrl-k one can search both, but it would be useful to have similar for in-text linking. This difference seems to me a bit unneccessary.
For example I could imagine something like term expands into ((term)) or [[term]] depending on what autocompletion is selected. This I think would be most useful with autocompletion.
On other alternative would be to have a keyboard shortcut that brings up a selector like ctrl-k but inserts a link to the selected page or block.