Just wondering why it matters?
For thsoe that don't care to use that 'feature'. It won't bother anyone.
If you wish to have easy access to changing SD card. You use it. If you don't care to have that slot there, you don't use it. It doesn't change the way the case is.
The case isn't really an aesthetic masterpiece. So having a small slot there isn't really going to change anything
It's just a usability and feature etc that doesn't get in the way, but can be useful.