: If I had to guess or bullshit up an answer, I'd say it's because at the time
: of construction its possible that the S'Pht couldn't float, or couldn't
: float very high. Perhaps once they were enslaved by the Pfhor their
: uh...floatability... was increased to make them better servants.
: Also, the staircases were convenient for the Fl'ickta, who could not float,
: but were left behind to inhabit or maintain the S'Pht infrastructure.
Or maybe the game woulda sucked if the designers hadn't put in stairs.
=)