Just uploaded an iPhone leather case comparison to YT. It includes the apple Leather case.
I agree that the Apple case is the best. I'm not concerned about the bottom being open as there is still a small lip so if you place the phone vertical it is still protected.
One word of warning though. Be careful how you treat the Apple leather case. I put too much leather conditioner on my one for my 6s plus and it just felt too sticky. What's the coconut oil that you used?