The dryer not coming with a power cord, in a bizarre twist, makes sense.
With the differing number of outlets available, and used, making a single cord that works for everyone isn't practical, or possible. So they leave the cord off.
When we bought the unit, they asked if we needed one, and if so, what kind of outlet we had. Apparently, some of the (not so) old ones already came with add-on cords. In which case, the installer only had to remove the cord from the previous unit and attach it to the new one (not what I'd do, but that is another matter). If the customer had no idea, the installers would make sure they had one of each on the truck (since they have 5 types to choose from). And they all cost the same, so it isn't like they are trying to "sell" a "better" cord. Just the right one.
Having done some service work before, I can tell you, nothing makes a customer happier than finding out an electrician would have to make a visit to change out the wall outlet (or cord) to handle the new appliance.
So, goofy as it sounds, yeah, it makes sense. At least they tell you up front that there isn't one on the unit.
Now, having said all that, if I purchased a common appliance or device, and it arrived without a power cord (as Bogie mentioned in the comment here), I would go through the roof. Yet, I have seen just that happen at work. Shipments of computers, monitors, and printers arriving without a cord on any of them. Now that is just plain stupid.