Ehhh dont disagree with you on a theoretical level, but are the average software development manager management skills sooooooo strong that it totally overrides basic technical proficiency? definitely there are a individuals that this is true for... but most development managers naw...
Except in very rare cases where a company is staffed almost entirely by former engineers, it is almost always the case that when you go far enough up the management hierarchy you will encounter someone who is perfectly smart, but doesn't happen to know why idempotent calls are useful (or even what "idempotent" means). That is the person this chart is intended for. It may not be your immediate boss, but perhaps HER boss, or another step up the chain.
