We have some industrial/commercial carpeting that has a short pile - pins "float" on it - and it is probably around 30 years old - over concrete.
I can not see where my roller chair has been.
The only marks on it are from where I set a hot iron on it (did not realize that setting it flat would activate it, and I did not have enough sense to unplug it) and where some fray check spilled on it.