That's like saying anyone is allowed in the staff room of a building
Where are you getting the idea that those type of rules and limitations apply anymore?
The Bluzone used to be open to anyone who joined, but now we have groups cutting areas off from the public. Sure you you can go in when the group leaves, but if they find out you were in there - or walk in on you exploring they're going to flip stuff because they think they own the place and think you're trespassing.
It's not so much a realistic role-play that matters, it's the experience that others will have - or should I say, won't get.
Do what you want, but I still think it's ridiculous.