I think one factor that's often overlooked with this advice is that many devices are designed in such a way that entering a secure password is a tedious and error prone process, and hence we should rethink whether passwords are the best way to secure said devices.

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.