What the follow-up took for granted
A greenfield adopter cleared a backlog of follow-ups before shipping and found that three of them — the three that were real work — each carried a premise that was false the moment you checked it. Not because the code had changed under them, but because a follow-up is written at the one moment you are least equipped to verify it. The lesson isn't "write better follow-ups." It's that a follow-up is a dated hypothesis, and the cheap place to test it is when you read it, not when you write it — so that is where StrayMark now puts the check.