I do find this quite unfair for families, especially those of us doing multiple school runs every day.
Mileage isn’t the same for everyone. A single person using the car occasionally is very different to a family with children in different schools or colleges. In our case, we’re doing several trips a day just to get everyone where they need to be.
I really think each situation should be looked at individually, because a “one size fits all” mileage allowance doesn’t reflect real life for many people using the scheme.