Maybe frequently was the wrong word; I would think spring-loaded would be designed for a lot of cycling between quick cuts and some other tasks, and you didn't want to leave the blade open.

Fixed blade would be best if you were constantly opening boxes and/or you could set your knife down open. And yes, for doing tasks where you are doing longer or more strenuous cutting (carpet is a great example.)

They money is fun to grouse about, but I thought the complaint about the low utility was the interesting bit.