This is the collective genius of everyone driving around looking at their phones. The government realizes that worrying about vehicles’ mechanical state is like rearranging deck chairs on the Titanic.
I mean, we’re a big country, we can do both. There’s also a strong correlation between people who are unsafe in one dimension making bad choices in others so things which are easy to enforce would be useful for re-establishing the idea that use of public roads is governed by laws.