What part exactly do you want to ban? One way materials? Fences? Shooting through holes?
What do do you mean by open area? Your screenshot looks like an open area to me, it was approved by the admins because you can freely leave once you enter and won’t get you stuck in any props.
If you have a specific suggestion on how you want to change up basing feel free to make them, but this post just sounds like you’re mad you couldn’t raid someone’s base.
This is also nothing new, I’ve seen it since we added the kingdom. I’ve successfully raided these kinds of bases before.
Edit:
This kingdom base would go down with a single C4. My small and simple crouch dupe (mayor's office) has never been raided with less than 3 C4 and regularly fails to get raided/revolted with just me defending myself with an unenchanted magnum sniper. If you want to argue about bases being too hard to raid, I think you should aim a little lower.