Two things consider: First, common sense is merely the accumulated human wisdom available to a group at one time. It's common sense today because Lean and Agile

Two things consider: First, common sense is merely the accumulated human wisdom available to a group at one time. It's common sense today because Lean and Agile has made it common sense. Second, we can think about these methodologies as duplo blocks, and smaller practices in concert as lego blocks. You're welcome to make more bespoke blocks, but iterating from first principles every time is just not necessary when we can rely on the common wisdom gained by using more common toolkits. First principles thinking is expensive and doesn't scale.