A small amount of friction is enough to reshape a behavior, because most wants are not strong enough to survive a minor inconvenience.

And so many behaviors are like that. It's like, well, did you want it or not? You know, like in the one sense, you wanted it so bad that you would check it every 3 minutes when it was next to you, but in another sense, you never wanted it bad enough that you would work for 30 seconds and walk down the hall to get it. And so, a little bit of friction can sometimes go a long way in shaping a behavior.