I was on the Majestic to Alaska in Aug. '21. We had a deluxe obstructed balcony, M102.
At no time were there restrictions on balcony access or lighting at night. Our next door neighbor had their light on most evenings. Our cabins were directly on the roof of the bridge, slightly aft of the bridge windows (if that makes a difference). They don't lock the sliders, just a warning about high winds on a sticker on the glass. The metal balcony wind deflector does a good job at keeping the wind somewhat at bay.
On our cruise, we were able to stand out on our balcony while underway in open ocean. The payoff to this room was when cruising the calm waters of the Inside Passage, a full 180 deg panorama from the comfort of your balcony.