Footprints are bogus, just an expensive add on that has little practical value. A built in floor is already fine, I have never worn one out and I have tents that are older than 30 years. If one did wear a hole in a floor it is an easy fix anyway. I am assuming reasonable ground conditions, like grass or flat rock, if one always camped on granite or something it might make a difference. Occasional camping on such surfaces is not a problem.