> So I wouldn't recommend winging it in a Big 5 interview unless you're comfortable with the possibility that a bad performance might blackball you there.

After going through "interview training" for one, they do blacklist people. But it's probably not as bad as you think. Also, even after getting pushed out of one org, another was extremely happy to offer me a job years later despite having all the info on me (even if I turned it down).

Individual hiring managers can have a good amount of discretion.