As mentioned who says Adam's descendants or any were not already doing so?
God just says don't use the blood as a nutrient.
Leave it alone.
Was not an animal sacrifice already the norm?
Eating it afterwards would be efficient and not wasteful.
Smart and talented humans would find use for all of the animal material. Even clothing.
Perhaps in speculation, righteous Noah had banned animal sacrifice and all things
the wicked humans were doing even if effecient?
His 100 year project was to preserve life, not Kill it.
Who knows his state of mind after 25 years, after 50 years, after 75 years, get the point? Yes I have some OCD.
I can relate.
The ocean called speculation is wide and deep,and you can sail on it till the end of time.
What makes one unsupported conjecture more popular than another, if not hubris.