I think that’s just it Rhod, it’s something that the GM and players have to agree on. 1 tree= 1 tree or multiple? Is that little snake that was modeled onto a jungle tree base an active creature that can attack, or is it just dressing? Because of the width of the figure base does that mean only 1 figure can fit down the corridor or is it intended for 2 to be able to stand side-by-side… The vagaries of modeling constraints can have a lot to do with this sort of thing too. horses for courses, of course! I have yet to see a rule set that actually says that things are one scale when outside, and another when inside, and as you say it would probably bend to many brains!
"I saw this in a cartoon once, but I'm pretty sure I can do it..."