I can look at the clock in the truck without any distortion like my other sunglasses.
Are you sure they are even polarized, then?
LCD screens are hit and miss with polarizers. It depends on the orientation of the LCD. However, it has absolutely nothing whatsoever to do with the quality of the polarizer.
Take glasses off, hold at arms length while looking through the lens at your clock. Rotate the glasses. If the clock display does not disappear at any angle, your glasses are NOT polarized. Can do the same test with a computer screen, gas station pump, etc.
Older LCD's generally disappear when the glasses are level, like you'd wear them. Newer ones are made to be viewed with polarized glasses and usually disappear at about a 45 degree angle. But again, that's a function of the LCD itself, not the glasses. ALL polarized glasses will make a LCD display disappear at some angle. Quality of the polarizer will determine whether that display is 100% gone at that angle, or only 98% gone. Whether the angle of disappearance is consistent across all parts of the lens. And how "wide" a range of angles leads to the disappearance. With better polarizers meaning 100% gone over a fairly wide range of angles.
Oakley does sell polarized sunglasses, but most are not. There are a lot of people who need sunglasses and cannot use polarized sunglasses. Pilots, for example.
My confusion, though, is your terminology of "distortion". Distortion has nothing to do with polarization. With distortion, things don't disappear. What may happen, though, is that straight lines appear to be curved. That's distortion. And yeah, cheaper sunglasses tend to have some distortion.