This argument is self-contradictory. You yourself say "Make sure that your needle is something that brings massive value to the lives of your potential users and most importantly." What is the "needle" you're referring to if not an idea?

An entrepreneur can ace everything you list in this post but if he's working on a bad idea he'll still fail. The best you can say from what you've written is "if you start out without a good idea, maybe you can iterate yourself into one. Maybe."

And there is a big difference between something being "not salable" and "not valuable". I can't sell my right arm but it's still pretty darn crucial to me.