I think it would be interesting to be able to format text with autocompletion.
As a picture is worth a thousand words, here’s what my idea looks like:
The idea would be to open a note and directly write (start or continue the note) and let the ideas emerge. It’s only at the end of the sentence when you choose to put a period that a window appears. If you don’t select anything and press space, the sentence is ended by the period.
Maybe redundant, but I like the idea of the shortcut “.” followed by a space to display a window, the window could also display snippets.