Here’s the thing about efficiency:
It is VERY fragile. A completely efficient system is one long chain of potential single points of failure waiting to happen. If any one link breaks, you’re screwed.
Robust, fault-tolerant systems rely on redundancy to route around failures until they can be fixed.
Back in the 90’s I described it as a “Faberge Egg”. Incredibly beautiful, intricate but very delicate.
Yes. I was in the wholesale hardware distribution business (wore a number of hats) for 35 years, with 2 privately held companies.
When I started in 1972, there were 225 full line wholesale distributors in the USA. Now there are under 15 (may be even under 10) depending upon how you define it.