That's why you get jobs at the consultancy that has to clean up those messes after companies are burnt enough. Most companies that get burnt will feel the reputation damage and go for reputable ones with integrity who respect push back.

Usually you're not selling work on a feature by feature basis. It's usually on huge projects or multi year deals.

That’s why you should go work at big corporate enterprises. Then you have both job security as well as the ability to spend as much time as necessary on getting things right. And you might even learn to say no to middle management.