I have always maintained that those "comfort" bikes; (also known as hybrids, and a few other names as well currently) are just right for a large majority of riders.
They are comfortable, easy to maintain, and quite efficient for the sorts of short-haul commuting and family "fun" riding done by the vast majority of people.
All the time I see well-equipped riders flogging a full-bore mountain bike on the street, often with the original knobby tires. They'd likely be much happier on a hybrid, and they generally cost less as well.
Or, someone with a roadster who has little idea of how to ride it. Often you'll see folks with their hands spot-welded to the "drop" portion of the bars, apparently under the impression that if they're there, you must use them.
They'd be far more comfortable using the "hoods" (the brake/shifter hoods) that are the proper hand position for most riding.
I end up setting up most all of our police patrol bikes so they are much more like "comfort" bikes than aggressive mountain bikes. Cushier saddles, higher handlebars, etc.