That would be much more interesting/useful if we had day/night cycle and were able to plan when to sneak, instead of trying to sneak at noon.
Would it though? With unchanging enviroment stealth could be properly designed. As cool as "wait for right time of day, changes of guards etc" sounds, I am yet to see them be enjoyable.
Just a quick closure to this off topic matter :
I am not even implying day/night routines but the simply fact that creating a partial/total obscurity system would wonderfully match with D/N cycle (even binary) where you can actually take advantage of that.
Plus, time will pass anyway with long rest.