I guess that's a good (or at least not terrible?) way to do it. It's slightly more secure, you're not going to get hacked by someone SSHing into your tablet because you're on their wifi, but anyone with physical access can SSH in if they need to
the SSH is also weird: It's not a fixed password. It apparently generates a random password, and if you go into the menus (Menu->Settings->Help->Copyright and licences) it'll tell you the SSH password it generated
that's an interesting approach to PC connectivity. Why be a serial port or a mass storage device when you can just be ETHERNET, with a virtual network to the tablet.