Well, that's the one caveat: they're kind of not anymore. The plastic clips that hold the guards on have gotten brittle with age, and they'll break if you don't use a specific removal technique. Also the blade can get stuck on there and could shatter if you're not careful removing it too.

Both unintentional age-related issues that wouldn't have affected them back in their day though, and once you get the blade off the first time you can prevent it from happening again.