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So while it has been raining cats and dogs for two days (fall wet season) I am looking my newly installed but but not sealed, screwed plumb-ed and leveled patio door and I am trying to understand why you need the entire door to be level plumb and square.

From what I understand the fixed door does not care much unless there is too much tension or pressure on it which could make it crack in time

The sliding door is more sensitive to level and plumb and square issues since:

-if will not close (if not parallel with the vertical side that it rests against when closed)
-it will wear and tear the track if the track is not level

The door gets shims and it has around 1/4″ space all around excepting the bottom side. The shims are used to fix it in position and to make it square and plumb but there is little tension that is extended to the door from the adjacent walls.

So my question is, why do you have to be so careful to make the entire frame square and plumb/level on all the edges ?

Edit: here is an example, exaggerated for the sake of argument