I totally disagree because that assumption is ridiculous in the context of the space craft like we have in ED. The ONLY case where this assumption is probably anything like fair or reasonable is perhaps in the context of the SLF. It does not require mental gymnastics to understand this simple principle.If you can assume the cockpit of your ship looks like a jet fighter or the space shuttle without realizing you are wrong then something is wrong in the game
My point wrt to the seat design was to emphasise the context for the size of the ship that is already present - if you ignore the ergonomic factors then you are ignoring a major factor in design of ship internals and the sense of scale reference points such factors provide.
As for "needing things to grab onto", there is the crew chair and other ship surfaces for moving around (if necessary).