Well I don't believe theses bigger blowers are as versatile as one thinks. If that was the case the company's wouldn't be making 6 and 8 different sizes of Back Pack blowers and depending on the job you're doing you should buy accordingly.
Everyone talks about having to have a huge blower for moving leafs, what about the individual who doesn't have leafs. Why should he spend all the extra money for something he well never have a use for.
Not trying to be sarcastic or anything but If I was to use your theory my edgers would be useless because my trimmer can do that job or so some claim. I was always taught there's a right or correct tool for every job and if you want the job done right you use that tool and I really don't believe lawn care is an exception.