If you keep your kitty safely confined, you control his or her access to dangerous situations. If your kitty ends up sitting someplace for hours on end, it will probably be someplace like this:
Now, if you don’t keep your kitty safely confined, you have absolutely no control over his or her surroundings. While a safely confined kitty may end up spending hours on the couch, a non-safely confined kitty can end up spending hours or days someplace much less safe or comfortable. Need an example? Here you go: Seattle City Light Rescues Cat from Power Pole.
Brother Henry is definitely a climber, so absent the proper boundaries he could easily become that poor power pole kitty. But the Guardians would never let that happen, so instead Brother Henry sits on comfy couches and safe cat trees.
Please give your kitties the safe boundaries they deserve. Make sure the only place they will end up sitting is someplace, warm, comfortable and protected from the dangers of the outside world.
So Sayeth Otis