Just applying reality to a space, honestly, while you still can... Rooms get stuff, fixed or not, and not usually on an angle to the room. No one argues this, until they have to add an exit. Then they don't believe reality anymore... for the moment. Then code proposals get submitted to try to spell out reality in the next code, and then the book gets bigger and more defined, and then people get more lost in it, and then professional building officials get more bound to definitive words attempting to spell reality, but missed the mark. Then designers get angry the code is too black and white for their design, and they want the authority to consider reality... Kind of like they wanted the designer to when measuring human travel.
A space where people will move diagonally, measure diagonally while you can.
A space were people will move at right angles, measure at right angles before to code makes you do it every single time.
Accept the reality of all the variety, before the code defines reality by the most restrictive of the variety. That is not directed to anyone, just a general rant I've offered up...