No it doesn't.
That hole in the hull is a huge safety risk. The glowing blue "shield" breaks down and * poof * the explosive decompression. Thus, you want it as small as possible because of two reasons.
1.: closing it as fast as possible
2.: the unusable area of a round entrance is HUGE, large ships could still just go through the middle. But it is more than enough space for more air to flow out in the above case. So cost / effect ratio is really bad … because explosive decompression is really bad.
I wish I coulde explain better, but I guess you get what I mean.
Well I understand what you mean however, a circular opening;
1) Has the maximum area for minimum circumference. ie for a given length of hole provides the largest opening.
2) Does not have any unusable area around the entrance if the ship cross-section is circular.
3) Is easier to fit a cork in, in the event of explosive decompression.
I guess either ships were designed to maximize the rectangular station slot geometry, or the station rectangular geometry was implemented to compliment rectangular ship cross- section. It's a chicken and egg situation.
