That you end up in situation where there are hours long lines and you don't have one station per, say, 1000 people at most
If you make it hard for the people you don't like to vote, then they won't vote. You never hear about rich white districts running low on election machines do you. Since the machines are provided by the state I wonder why that would be. π€
Its to make sure that they don't get a billion questions about what button to push next and not being able to complete homework because of button confusion. Does it still need to exist today? Probably no but good luck getting rid of a standard adopted by all manufacturers of textbooks.