I wouldn't say it is a mistake. Like any other style bike it is a good choice for some and no so good for others. I think the LBS finds it easier to sell Hybrids as a "do all" to new riders primarily because they don't know what they want. It is a good starting point because you can get them fairly inexpensively and they are easy and comfy to ride. So In my case I call it a choice but it turned out to be a compromise. If a new rider comes to me and says what should I get I would probably recommend a entry level hybrid to start but plan on upgrading later. My wife started on a beach cruiser. THAT was a mistake. It totally discouraged her from riding because she quickly couldn't keep up with anyone else in speed or climbing. That's what she thought she wanted because it looked comfortable. Hopefully someday I will be able to upgrade her to a Hybrid.