Quintuppling down. Your stamina for refusing to try and understand something is impressive. FWIW, when I first engaged with you, I really wasn't trying to be a Dick. I figured you just didn't realize. I thought I could help you understand if you didn't know what the difference was. Now I'm not sure what this is, but let my try and explain again.
If someone has a 39% fg% you can only guess they are inefficient, you can't know. It would only take them making 56% of their makes as 3s to have an efg% of 50% or higher. 56% isn't some crazy number that would never happen. There were 70 NBA players that had 56% or higher of their attempts from 3. On the extreme end is Sam Merrill who shoots 90% of his attempts from 3. He only has a 40% fg%, but an elite efg%.
Why use a metric where you have to assume, when you can easily use a metric that let's you know?
Look, I was honestly trying to be helpful and then I did get condescending, so I apologize. I'm trying to be helpful again. You can keep talking about basketball and use fg% to describe efficiency and people will continue to think you are dumb. I don't think you are dumb, I just think you are stubborn. So, do with this information what you will.
(Just in case you are curious how I came up with 56% of makes from 3. 39 + 11 = 50. 11÷.5 = 22. 22/39 = 56%.)