Also they aren't free in the US and they aren't always easy. Sometime you have to make appointments at DMVs and you have to get there as well. There are different fees and different durations per state.
https://worldpopulationreview.com/state-rankings/drivers-lic...
If you think about someone living in a city where they can take the bus and they don't own a car, they might not have a license. Then they might not get one just to vote in an election every four years that will just go the same way the state always votes (of course they end up not voting for everything else on the ballot).
Then maybe you shut down some polling places, split some up, move some around. Maybe you expire people's registrations early.
This is how you bend statistics to your side. It isn't about one person technically being able to navigate every obstacle. Every time the bus goes around a corner some people fall off and that's the point.
You are falling into the exact type of thinking that the people who create these situations want.