You'd be surprised how much pressure can go down when you have fuck you money and you don't give a fuck about running some business or getting more, just spend it and enjoy life. Met a few such types, and they feel zero pressure.
You still have inevitable stuff to worry about like relationships and health of course.
But then it's a question of whether they have the motivation to complete the projects they want to.
It's really easy not to ship things, and never know where they might have led.
Often they do not give a fuck about projects either. Just living their best life.
Then as the deadline approaches, not finishing at all is a kind of “fucking it up” that is not at all abstract or hypothetical. So now the anxiety of the deadline is focusing you on the task. It’s exhausting for one, and for another when you get a good review on your work you feel like a fraud, because everyone else took weeks to do this and you slammed it out in 6-10 hours.
My first thought was: you're crazy.
But then I thought deeper and as an adult I realized that there is a cost/benefit to everything that somewhat didn't exist as a child. Most of us cannot escape triggers of anxiety anymore. If you have everything you need, and complete freedom, you still can't escape the arrow of time for example.
I still think zero pressure doesn't work in the way you think it does. It's exactly something someone says when they are pre-occupied most of the time. It's wishful thinking.