Catalyst 3750 Stackwise technology

I am new to the WS-C3750X-24T-L  stackwise technology but from that I understand if two 3750s are connected together in the backplane with the stackwise technology, if one fails the stack is still running. But if one of my switch fails, all the users connected to that switch will be down. So what is the benefit of the stackwise technology. May be you can shed some lights on the subject.

Allows multiple switches to be managed as a single unit and gives higher bandwidth between the switches compared to using external switch port connections.

Sort of like have a chassis based switch (Catalyst WS-C3750X-24T-S, 7500, Nexsus 7K) without the expense of a chassis.

Even with a chassis if one blade fails, all of the devices connected to that blade still fails.