@JimmyT - I have to completely agree with you. With the advances in tire technology there is almost no reason to have seasonal tires simply because the costs do not justify the means.
If you have two sets of tires that you change out during the seasons you first have to pay for both sets of tires, doubling your costs, and then you have to pay a mechanic to install them.
Even if you know how to change tires, that means that you have to go through the effort to change a tire by yourself four times, as opposed to just once. It takes enough time to change one tire and just think, with seasonal tires you have to change tires eight times throughout the year unless you pay a mechanic to do so. Either way you will waste time or money with seasonal tires so it only makes sense to use all weather tires.
All weather tires are underrated as far as performance goes and I think that they perform well in wintery conditions. They may not be as good as winter seasonal tires, but they get the job done and perform well enough under these conditions to justify saving the costs of only buying this particular set of tires.