100% is easier than 99%

It’s substantially easier to do something 100% of the time than 99% of the time. For instance, suppose you are trying to develop habit X.

Which is easier:

1. Every day, you think about whether or not you’re too tired or busy to do X and then try to threshold this so that you do X on 99% of days.
2. You just do X by default and don’t waste compute thinking about whether to do X.

Clearly 2 is easier.