[bastawhiz]

Counterpoint: why am I able to buy a Ram 2500 and drive it without a CDL? I rented one recently to help a friend move some furniture and it's an unbelievably big vehicle.

The example of the standard you suggest could equally apply to large motor vehicles: you need special training above and beyond the status quo for vehicles that meet a certain standard. To your own point, motor vehicle laws were largely written based on outdated assumptions about the size of trucks and SUVs.

[tayo42]

You can rent and drive a truck bigger then that at uhaul

[bastawhiz]

Arguably you shouldn't be able to, at least without being qualified to drive it. Just because it's legal doesn't mean someone made the active choice for it to be legal.