I taught election law for ten years.
After the fiasco in Florida, in 2000, federal laws were passed to reconcile election laws between the states, so election laws between states are now similar. When the new laws were passed, states were required to change their laws to coincide with the federal ones. Those were enormous changes and I was in the middle of that as I had to learn those new laws to teach those new methods. Those laws included the beginning of Provisional Ballots.
Anyway, election laws between the states are not that different now.
What is new and I think will continue to happen, is, states deciding to go with all mail ballots - no voting precincts anymore. That saves millions of dollars for every county/parish. There won’t be any transportation to voting precincts because voters will vote by mail.
That sounds like an open invitation to fraud, especially if you are talking about, e.g., paper ballots for optical scanning. What is to stop party organizations (think Democrat) from filling out the ballots for people who they consider elderly and/or disabled and voting a straight party line for them? Doesn't even pass the smell test.
That system sounds even more subject to corruption than the old system of voting on paper ballots at a public polling place.
Better to spend some public money on public voting precincts to safeguard some integrity in the system.