Yeah, there are functional reasons to use clips and strap as well as clipless. One or the other will be more or less suitable depending on riding conditions, length of ride, intensity of ride, purpose of ride, destination (when applicable), etc. etc..

Really, it's like saying the only reason to ride clipless is to fit in with the other roadies. Undeniably, some people are just after a certain "look," but that doesn't mean everyone who does it is just another fashion victim.