What makes the Room sequence an unconventional ending for 2001: A Space Odyssey?

The sequence starts with a point of view shot of David. It shows a corner of the room. In the room, an ambience sound is like from the universe. The next shot is an extreme close-up of David. Some colorful reflections of light fall on his face. David’s head shakes. His face is reddish with a tense expression. This shot has a warm tone.
By contrast, the following shot has a cooler tone. It is a view of the bedroom with the dock station in it. This wide shot shows the mise-en-scene. The room design is classic European style. Then there are two more shots of different angles of the same scene. The next shot repeats the extreme close-up of David, which appears earlier. The David’s breath gets heavier. Then, it is cut to the shot that is shown at the very beginning of the Room sequence, but this time David himself stands beside the bathroom in red spacesuit. The red color is in a sharp contrast with the room color. Following that, the film is cut to medium shot of David, and then cut to close-up of David’s wrinkled face. Next is a wide shot that shows David crosses the room along a diagonal line. In the following shot, David walks in the bathroom, which does not show the continuity of the spacing. In other words, the editing does not follow the continuity of the character’s movement. Then, the camera pans from left to right in the bathroom. The camera angle is high, as if David looks down, to show the bathtub, floor, etc. After a close-up of David, there is an aperture-framing shot, in which, David looks at himself through a mirror in the bathroom. Then, David turns away from the mirror.
Coming up is a tracking shot of the bedroom from the bathroom followed by a medium tracking shot of David. Next is a tracking shot of the bedroom. When the camera focuses on an old men’s back, the