> I've found "efficiency as the opposite of stability" a very powerful concept to think about I think this concept misses capacity. I my opinion, it is crucial

> I've found "efficiency as the opposite of stability" a very powerful concept to think about I think this concept misses capacity. I my opinion, it is crucial that you always leave some over-capacity to have stability (lets say, you are running at most at 80% capacity). If you then increase your efficiency without sacrifying your buffer capacity, everything is fine. But as soon as your try to run at more than 80% capacity to be more efficient, this slightest problem could have devastating effects.