Correct. The point is your employer is saying "this occupational hazard exists; you must wear this PPE to reduce the risk of the hazard whenever the hazard exists for you". What they don't then get to do is say "as a reward for a job well done, you may temporarily remove your PPE while the hazard still exists".

All this shit is either an occupational hazard or it isn't. If it is, then PPE isn't optional; and fines and firings ensue for non-compliance regardless of who it is. If it's not, then it should be taken as seriously as a dress code.