I think one way you are supposed to relax and enjoy is understanding the basic 4% rule, and the statistical security that should provide.
The other big thing that I'm going to rely on is my flexibility. I'm not going to blindly withdraw my 4% plus inflation. If the market is shit, I will flex my choices. Maybe a staycation this year instead of planned travel. Maybe we do meatless Mondays. Or put off buying a new sofa for another year or cut back on sparkling water consumption. Maybe we even take on a small part time job or two. Even bringing in a couple thousand a year is a couple thousand less I would need to withdraw. An cutting costs by a couple thousand is another couple thousand I don't need to withdraw.
And if you have concerns with your stress about that, then 60/40 may not be for you, and 4% might not be either. Maybe 3.5% or 3%. You just have to decide how to balance working longer with that extra cushion. I have enough faith in our ability to apply common sense and adapt that I don't feel it is necessary. And it does help that we aren't planning a lean FIRE so there is fat to trim.