This is a good point, and often the reality - it’s unfortunate that it is being downvoted. But it’s a defeatist stance. It’s a central part of the designer’s job to contend that human factors are important, and explain what the effects of shortcuts and poor user experience are on the value of the product and the well-being of its users.

If you’re lucky your client hired you because they, too, care and believe design to be important, but that’s far from a given.