Just because someone is watching a paper being fed thru a machine from a few feet away, doesn't mean fraud can't happen. Sad that some do not realize this.
Combo of illegitimate voters that Project Veritas brought to light , algorthym of the Dominion machine used once again, and much more can all effect what the poll watchers see.
One of the anomalies brought out and PROVEN was that Dominion machines were kicking out ballots at a 68% rate requiring intervention by a tabulator person at another (unobserved) machine.
The problem described is that ballots mailed to Republican leaning districts had alignment marks that were "off" causing the readers to not "see" that a vote was filled in for (usually) Republican candidates. The ballots sent to Democrat leaning districts had no such printing problems, and therefore read into the ballot counting machines with few errors.
Once a ballot has a problem being read, an image of the ballot is sent to a tabulator who either lets it go through as Democrat, Republican, no candidate/party selected for that race/ballot, or rejected as spoiled.
So, Trump votes were being short-circuited while Biden votes were being automatically added. Without observers at the tabulating machines, the scanners could be observed all day and night without anyone seeing what was really happening to the votes. This method could have easily been employed for any election. The people having the ballots printed and the people doing the error corrections have the access needed to pull that off. Since the printing "problems" are minor, it would be hard to prove intent, even though the problems only exist on ballots in one party's districts. The tabulators fixing the "errors" are often out of view and working on a few terminals vs. many ballot counting scanners.
This process is another reason why a recount/audit is useless. A misprinted ballot that needs correcting once, then recounted as an image that's in error will never point to the fraud that occurred.
The proof is out there in the testimonies given multiple times in GA and other states. It's easy to find.