For large diffs, I’ll have the human driver walk me through the code in a call and if they understand it well enough to explain it to me, and explain the implications of the changes, that’s good enough for me; if they can’t answer how something works, I’ll respectfully turn down their contribution.

This cost shifting is how I stay sane and avoid burn out at work as well as stay apprised of major behavioral changes in the software we run.

I also think it’s important to emphasize that in an organization, individual productivity is secondary to group productivity, and group productivity is different than the sum of its parts.