It's a complete mess when working on actual engineering tasks, I can't imagine how many hours have been wasted converting/correcting between units used by stand

It's a complete mess when working on actual engineering tasks, I can't imagine how many hours have been wasted converting/correcting between units used by standards versus projects. There's also abominations like the Energy Efficiency Ratio expressed in Btu/Wh, which yes, you are reading it correctly, is the ratio of energy in IP to energy in SI. I honestly don't understand why something so useless exists. Units actually should mean something. I use them as a quick way of intuiting about physical relationships and something like EER completely removes that intuition and just makes all EER values a stupid number to be memorized.