He doesn’t need to check them, but he can certainly go “hey, make sure we’re following safety protocols!” so others can actually do that work - or at least, Baldwin can cover himself by saying he was trying to follow safety protocol.
You say it’s the armorer’s fault (which it is), but Baldwin still could’ve done more to ensure safety on his end without checking every weapon prop like you said. Ask yourself: if the people in charge don’t follow policy and procedure, do you think the people below them would?