The problem with carpeting the bottom is you can't tell if you have any delamination going on down the road. Anytime I see a floor that has been covered up with anything other glass then I figure there was a problem somewhere that they were hiding. Now that can go for a vener job also. But if the guy is going to go thru all the effort to make the vener look right he usually spent the time to make any necessary repairs to the floor. I always leave about a 1/4 inch gap between the stringer and the vener so i can tell if the stringer ever comes loose from the bottom.