Yes, that's why it needs to be modified!
It's not dead weight if it gets my feet into the right position to be comfortable in the car. My feet need to be raised, so tape on the floor won't do that.
I think people underestimate just how important it is to be sat in the perfect position, for safety, weight distribution and of course ultimately car control.
I doubt I will use the clutch footrest on a hillclimb, but this was the best quality carbon fibre false floor I could find, at a good price, and it happened to have a footrest built in.
Who knows, if I ever do a trackday it might be useful.