Pretty much all cars have an oil pressure switch these days. Meaning once the oil pressure goes above a certain threshold the oil pressure gauge goes to the good range. It doesn’t move until the oil pressure drops below that threshold. Essentially it hides the actual oil pressure, which can fluctuate based on RPM, temperature, wear, and oil used. I don’t know how many times I’ve had friends, family, or coworkers think they have a problem because their oil pressure is moving while driving, or it’s at a different but perfectly fine part of the gauge.

I don’t think people are incapable of understanding. I think they don’t bother to try or have the time to.

Probably for the same reason modern cars don’t have an oil pressure sensor these days. Too many users don’t know how to parse the information.