Since we're on the topic of 41 cards smoothing over land-drop-density, don't forget: the statistical likelihood of hitting your land drops with 17 lands on the play is virtually the same as 16 on the draw. Sideboard in/out that basic!
I've heard this line before, and have also read about it in an article on CFB, but without a
lot more additional research onto this topic, I'm unconvinced that most situations call for subbing out a land in a limited environment. You run the risk of colour screwing yourself to a much greater degree when you go down a land - even if it's just a basic - because the nature of most limited environments means that your mana base is a lot shakier at producing all of your desired colours than the equivalent constructed mana base. The potential for colour screw remains the main reason that most aggro decks run 17/40 = 42.5% lands, even when their constructed counterparts often get away with 23/60 = 38.3% lands, or fewer.
As a corollary, if you're running a mono-colour aggro deck in limited, there are few reasons to go above 15 lands, or possibly even 14. When colour screw is no longer a factor, you can get away with a lot more than you'd normally be able to.