The action bias refers to “The tendency to act immediately, even if that action is probably useless, possibly even harmful”
People like action. Action feels good. Nobody will blame you when you’ve done something wrong, but you wíll be held responsible when you’ve done nothing. Passivity has a bad reputation, it feels lazy.
So we change the rules all the time; we enforce emergency laws, we change school methods, we build walls to keep immigrants out and we knock on wood to keep bad luck away. And let’s face it, nobody wants to pay a consultant that advises you to do nothing.
The UX part is simple: don’t give ány room for hesitation in your design. If you will, people simply will do something else. Avoid confusion at all costs and keep the flow going at a comfortable speed.