I don't mind a 1P tent with single door at the end. But, it seems like some designs, maybe that SG included, can allow rain into the interior during ingress/egress unless you are careful not to open the fly door much. I have a tent like that and in downpours and blowing rain it is a bit of pain. If the SG has a big vestibule, then maybe it wouldn't be an issue.
On a 2P tent, I would want two side doors.
On a 2P tent, I would want two side doors.