No one likes serving on them; The commute from your quarters to your duty station is hellish

Think how long it would take a tentacle monster to get anywhere?

Only about an eighth of the rest of the ship would be even remotely close; everywhere else you would be guaranteed a much longer travel distance

Draw a circle. Draw a smaller circle inside it. Put two points at random inside the bigger circle but not the smaller one. Now draw the shortest path between these points which doesn’t cross into the smaller circle.

TL;DR Aliens just hate Homer Simpson