The US is ranked as a 'Flawed Democracy', what needs to change?

[Bofferbrauer2]

TheMisterManGuy said:

Get rid of mass Mail-in Ballots. They're slow, unreliable, and can be easily manipulated by either political party. Mail-ins should only be used in special cases like military or citizens traveling. Conservative or Liberal, nobody wants to wait days, let alone weeks to find out who won an election, regardless of who wins. The fact that several states kept their COVID-era election rules despite COVID being pretty much over is pathetic. Elections should be done in person, on one night, and the winner should be decided the same night. If other countries can do this, why can't the U.S.?

I don't understand why there's so much delay with mail-in ballots. Many countries use them, and in none of them do they take anywhere near as long to count as they do in the US. What's so special with US mail-in ballots that it takes so long to count them?