I think Steven has answered this pretty succinctly, no need for you to get your crayons out, you can save them for colouring or whatever you do.You really dont get it, nothing to do with the wear, that will have a small effect, that will be static though. The speeds changes drastically as you drive, any turning of the wheel creates big differences on the travelled ditance of each wheel. I can draw you and steven a picture with crayons if that will make it clearer.
(just a little note on this attempt at an insult, if you are the one getting the crayons out, you are the one needing the crayons. The medium used to draw the picture has no bearing on the way it is understood, I'e I could draw a picture for my 2 year old, using the most advanced computer, he can still tell if its a car or lorry or whatever. however he is the one who needs to use crayons himself because of his tendency to draw on his hands or arms and he goes off the edges off the paper which marks the table..... that's why you need crayons If I wanted a diagram, from him, then I might be more inclined to give him crayons to use. So if you would like to draw diagrams feel free and if you need to use crayons to do that, well that's ok as well. Just try to keep it on the paper)
Yes, the rotational speed will vary, based on a whole host of things in relation to the movement of the car, especially turning, but as pointed out, the computers in the car know all this. They are somewhat more intelligent than you give them credit for I think there is an element of Dunning-Kruger effect going on in the way you analyze.
The fact if someone can make a algorithm to calculate and map the exact layout of a room or building based on reflected Wifi signals, then I dare say someone could come up with software that could give a pressure reading of each tire, based purely on the input from wheel sensors and other sensors in the car without a tire pressure sensor being needed and get a pretty accurate reading.