I guess the naming and the notation of the tune both contribute here. If you have a 4/4 tune and you play it with swing then it can still be a reel and notated as such. As soon as you call it a hornpipe then the commitment has been made and any notation needs dotting. Regarding the 6/8 jig, I've got one that has a fair amount of dotting and playing guitar rhythm to it is most unusual.