Also the more exceptions you have to rules, the more confusing it is and the more likely people are going to fuck it up.

“Always wear a hardhat on site” - easy. simple. minimal room for interpretation.

“Always wear a hardhat on site when any of the following conditions are true: [a, b, c, d] unless [e, f]” is going to lead to errors, and then people will get hurt.

People aren’t that smart. Especially when they’re not motivated, or distracted.