For example, while your computer or phone may have a password manager, I'm pretty sure your car, TV, games console, etc doesn't, and so having to enter a lengthy and difficult to crack password one letter at a time via a stupidly clunky interface is a usability and security nightmare in of itself.
And even with a phone, entering a lengthy or complex password via a touch screen keyboard is quite the ordeal. So I wouldn't be surprised if many people don't bother with good passwords simply because it's easier to enter a single word with a few numbers tacked on the end via a touch screen or remote control.
This is just wrong. Diceware passwords are better for passwords that need to be memorized.
