I don't understand the need for e-voting. Germany's entirely paper-based system works fine! After voting closes, volunteers count the votes for a few hours and we get a result.
Every election has "bunch of weird stuff happening" because every election has losers that don't like to lose, either with paper or e-vote.
To use a soccer analogy, it is like the losing team that blames the referee.
The ones complaining about "bunch of weird stuff happening" are just playing Trump.
In fact, the issue of fair elections in Brazil has become background noise because of these so called "referees". They have usurped so much power elections are just theater at this point. It doesn't matter who wins because in the end it's the judge-kings who rule the country. There's no point in even discussing the matter until their fall.
So paper systems require ballot boxes and polling stations for the vast majority, which makes elections expensive, complicated, and generally problematic. And unpopular, with low turnout, particularly during flu season and pandemic.
And bigger picture, once you prove a system that’s easier, more efficient, reliable… you could expand to more votes on more things. Like… the Swiss do.
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(A German advocating for paper-based bureaucracy… whatever next? ;) )
For instance, such a system would be immune to corruption. That's one of the major reasons such a system will likely never appear.
OTOH, it enables vote buying and intimidation at scale: you vote from home in exchange for 5€/not being beat up and have to film yourself doing it, so that the local bad guy gets authorized to bulldoze the local nature reserve.
Vote buying and intimidation already exist, but proving it is harder, all remote voting on everything would just make it more convenient.
Maybe a dual system of paper ballots and e-voting could be good so that they cross check each other. Can't stuff paper ballots without manipulating the digital counter, can't manipulate the digital counter without stuffing ballots. A digital counter also enables meta analysis which could identify suspicious patterns, like a wave of votes for a particular candidate.
Someone gets hand of an empty ballot, they fill in the ballot and give it to you and tell you to come back with another empty ballot. Rinse and repeat. Of course, with today's smartphones there are simpler ways to do this. Also moot if you can vote by mail, which is why voting by mail is a really bad idea.
The ballot you throw in the box does not have the sticker (vote is anonymous) and you cannot come in with a pre-marked ballot (and being out one) cause the number would not match.