> Would at least like to use it for stop and go traffic, which is about the only thing I trust FSD for.

Depends on the type of stop and go driving. Crawling along at 15mph, sure. But the most dangerous driving scenario - whether human or machine is the driver - is a scenario with large variations in speed between vehicles and also limited visibility.

For example suddenly encountering a traffic jam that starts around a blind corner.

Dangerous for some humans. If a self-driving system is taking a blind corner, I would expect it to be approaching it at a more appropriate speed.