Got your point but the direction of result isn’t right imho. Why should WFH employees accept lower compensation? In theory and in now in practice, they can start working anywhere in the country. If they face a reduction because of WFH, they will move to another company for sure. The remote work situation together with aging society massively shifted the power to employees. You aren’t bound to an area for work anymore.

I think employees that must go to offices should get an extra raise to compensate for the fuel, time, and clothing.