The other POV is that "coupling" to the floor material allows sound to be conducted through the floor material to the listener, and that sound will have a different arrival time than sound conducted through air. Although concrete is less resonant than wood, it still will conduct sound.
This POV holds that "decoupling" or isolating is the way to go. Many proponents, including Genesis and NOLA speakers (the better models all have built-in decoupling), Barry Diamant, manufacturers like Stillpoints, Symposium (Rollerblocks), etc.