Best use of time ethically speaking. Goal is to develop ideas.
Sitting and just sort of existing for a little while without thinking (to the extent I'm able to refrain from thinking, which varies) keeps me grounded in the world beyond thought. If you forgot you had an entire body and thought you were just a foot, stubbing your toe would hurt a lot more.
Oh, man, that's a good one. Thank you for this insightful nugget to start my morning.
Many have gone through that and found they need more balance, and practicing non-thought is a good way (the best? Dunno) of getting that.
It's best to do both for different purposes. It's kind of like biking and weight lifting. You could count both as "exercise" but they serve different purposes and can work in conjunction.