Earlier quoted context omitted.
"Innocence until proven guilty" is relating to an individual being formally accused of a crime in a court of law. We are talking about a PUBLIC PROCESS, which in my opinion doesn't fall into the same category. The burden of proof shouldn't fall on either side, it should be publicly verifiable . If a third-world country controlled by rebels ran a "free and fair" election, where they "counted" the presidential ballots…
Every time the states did something to check the integrity of the election, such as hand-recounting the ballots, or doing a signature verification audit, it was simply dismissed out of hand as a cover-up and not a real investigation. The bar set by the "stop the steal" crowd was that unless you uncovered that Donald Trump really won the election, you didn't investigate hard enough.
That explains why hand-recounting of ballots wouldn't make a difference. Also, I don't believe signature verification was widely used, or at least wasn't used in the critical swing states where it really mattered. It should be used everywhere considering the technology is mature enough and easily available.