The problem with having a leather case without the open bottom is getting the case on and off. Unlike TPU and silicone, leather does not stretch. So if the case does not have the open bottom, then it cannot possibly be a tight fit or else you would never get it on and off your phone.
What's nice about this case is that it is leather only on the back, and then is a nice rubbery and grippy TPU around the edges. It protects like an Otterbox, but has the nice leather back. It also doesn't suffer from lousy volume and power button feel like most leather cases, and has very clicky buttons.