Ray363 has a point about the line just being a guide, but a snapped line on a long run like that is a huge red flag. It means your wall was already under stress and pulling on it. I'd bet money your base was out of level.

Exactly. They test in labs, not real houses.

Would an AI even know how to dial a phone? I'm still trying to teach mine to stop setting alarms for 3 AM. It's a work in progress.