A thought suddenly occurred to me while practicing.
I fully get that stances train muscles, endurance, balance and many good things.
But take the fighting stance from tang soo do, which from what I can gather is the back stance from shotokan or the cat stance from various styles of kung fu. If you are fighting for real or in sparring, every joule of energy counts. I wonder why then, we would choose to put 70 to 90 percent of our entire body through one bent leg.