Still not sufficient though, you only need to hack enough to get outside the automatic recount margin. You also need hand-recount of random samples in all elections.

You only need to recount heavily when the election is near 50%, because the higher the margin of victory, the fewer random samples you need to detect fraud. This is what Georgia actually does. The automatic margin is for runoff elections.

Of course, if someone hypothetically hacked an election even more brazenly to get outside of that margin, the result would be even more unexpected and likely to be manually contested.

I'm not saying they were hacked. I'm saying the layman needs to be confident beyond a reasonable doubt. A normal non-security professional needs to understand and have confidence in the system they use to vote. Most people don't even know how to troubleshoot computer issues beyond rebooting, let alone understanding complex IT security or auditing measures put in place for these machines.

If you watch the video you can see that a layman would easily understand how it all works. It literally prints a ballot where you can verify your choices, and you drop it off.

This is pretty much the gold standard: a paper trail that can be audited every step of the process.