Users'behavior is disconnected from what they'd want ?

Hello everybody.

I'm reading ' The Power of Fifty Bits' by Bob Nease.

Unlike user-centered design, fifty bits design assumes that users may not really know what they want, and even if they do, they might not put the effort into actively pursuing it. Fifty bits design assumes that much of the time, users’ behavior is disconnected from what they’d want if they spent more time thinking about things.

Would you please tell me what the bold part means?