I do agree with you, first I don't know why a person would walk on any deck barefooted, but if I must, a synthetic deck would be my preferance.
Trex was pulled from my area because of the intensive heat and UV's. The boards would warp, cut, twist, contort, and buckle. The deck was installed by a Trex representative. I really think that heat is the factor that will nosedive synthetics.