If you can handle pressure, time constraints help you focus. It's more likely to get things done when you run out of time.
If you accept a smaller creative scope, design constraints help you innovate within a fixed set of variables by limiting how many pieces can move.
It's on you to set realistic timeframes for each task—not too much time, not too little—and it's on you to minimize your creative degrees of freedom—don't try to be creative in too many areas simultaneously.
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