Originally Posted by BullMcGiveny
Again, no one said its a mistake.
Not one called it a flaw.
You may not have outright stated that it is a mistake, but your comment that Natasha being the female lead is not "what's best for this particular movie" certainly implied that it is a mistake.
And as for Natasha being played by a more "bankable actress," it's not like Marvel couldn't have cast a well-known, popular actress as Sharon. They just chose to cast some random basic TV girl instead.