Agreed but I wouldn't call it a misconception. A misconception is something that is proven wrong and I think the jury is still out, is it not?
Roderick Haig-Brown (Fisherman's Fall) references Dr, Black
"The high level of lactic acid in the blood are not necessarily the cause of death, though they coincide with death. It is known that a distrubance of this magnatue reduces the power of the blood to combine with oxygen and carbon dioxide and the capicity of the heart to pump blood. The real significant point is the buildup of the contrentration continues in fish over a period of several hours after violent exersice, whereas with mammals it ceases with the activity and recovery begins immediately. So a fish released prompty, in apparent excellent condition, almost certainly has not reached the full state of exhaustion brought on by it struggles."
Humans have dropped dead from exhaustion, so it doesn't make sense to me to purposely fight a fish to exhaustion when it can be avoided.
In other words, better safe then sorry.
ps. Sorry for the hijack.