One of the things that I notice is the expired signs that become part of the environment and no one noticed them anymore.

Entry without face mask is forbidden - yet no one wears a mask

Opening hours during Christmas holidays - it's January already

And no one is in charge of removing these signs. Ok, the signs are trivial, but if these trivial regulations are not removed, who removes the laws that are obsolete? Probably nobody too.

But if I can enter without face mask to a place that has a sign forbidding this behavior, should I respect laws that are clearly obsolete?

That is why I like rules that are not formally written. They automatically expire when no one tells you that you're breaking them.