Genie - no, I was simply describing my own practice re dots &c ··· I don't think there is an actual rule — indeed ... I am pretty sure there isn't - so I just go along merrily scattering them decoratively — just as the spirit do move me .·.·.·. -=-—

Seriously — I think one can generally tell when they are used elliptically &/or when they suggest a sort of mental aposiopesis.

Agree absolutely with you re 'flout' & 'flaunt' - the confusion that above all others fills me with the Aaaaaaarrrrrrrrrggggghhhhh-factor ...