> The first example I'd call "ballot stuffing"--it's really a catchall term for shenanigans around turning the actual returned ballots into an official count. This even would cover things like poor ballot design (e.g., butterfly ballots in Florida's elections) that aren't strictly speaking fraud
You can call it ballot stuffing, but you are inventing your own definition when you do that.
"Ballot stuffing or ballot box stuffing is a form of electoral fraud in which a greater number of ballots are cast than the number of people who legitimately voted. The term refers generally to the act of casting illegal votes or submitting more than one ballot per voter when only one ballot per voter is permitted." [1]
> The latter example is a fourth category of electoral shenanigans that I'd loosely term voter intimidation; essentially any mechanism by which people are dissuaded from casting a ballot in the first place, which I omitted because most of this category is unfortunately legal.
That is absolutely not voter intimidation. I had my registration changed by someone who did this, so I am well aware of what happens here. I was not intimidated. [2] Voter intimidation is a federal crime and defined in the Civil Rigts Act and the Hatch Act.
> A more specific look at how to fix an election might dive into the details more, but grouping them in one category doesn't really affect the analysis here.
It absolutely does affect the analysis. You should be able to see that, since I pointed out two specific threats that your categories didn't cover. There are more, too. You cannot properly model threats unless you identify the actors, the vulnerability, how the vulnerability can get exploited, and some sort of analysis. You need to create a model of risks, not just pronounce "There are basically three kinds of voter fraud" using an incorrect, incomplete list. If you don't model risks, how do you know your categories are correct? THat's like when Oracle called itself, "Unbreakable". [3] [4]
[1] https://ballotpedia.org/Ballot_stuffing
[2] https://ballotpedia.org/Intimidation_of_voters
[3] https://www.computerweekly.com/news/2240043867/Ellison-Oracle-is-unbreakable
[4] https://www.cnet.com/news/oracle-unbreakable-no-more/