> Another simple one is building artifacts in CI and doing quality checks, I have make some silly manual errors that have been very expensive during export.

I set up a CI pipeline for the hardware company I worked for. It automatically generated things like gerbers and board renders for each commit, and made them available as PNGs. I added a little tool which made it really easy to view the results side-by-side, and see both the front and the back. It definitely saved us from some really expensive mistakes a few times!