"Duffer’s advice highlights a conflict between technological advances and creators' goals. Features like the ones he mentioned are designed to appeal to casual viewers by making images appear sharper or more colorful, but they alter the original look of the content."
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Settings that make the image look less like how the material is supposed to look are not "advances".
Q: So why do manufacturers create them?
A: They sell TV's.
Assume that every manufacturer out there is equally capable of creating a screen that faithfully reproduces the content to the best ability of current technology. If every manufacturer does just that, then their screens will all look extremely similar.
If your TV looks like everybody else's, how do you get people strolling through an electronics store to say, "Wow! I want that one!"? You add gimmicky settings that make the image look super saturated, bizarrely smooth, free of grain etc.. Settings that make the image look less like the source, but which grab eyes in a store. You make those settings the default too, so that people don't feel ripped off when they take the TV out of the store.
If you take a typical TV set home and don't change the settings from default, you're typically not going to see a very faithful reproduction of the director's vision. You're seeing what somebody thought would make that screen sell well in a store. If you go to the trouble of setting your screen up properly, your initial reaction may be that it looks worse. However, once you get used to it, you'll probably find the resulting image to be more natural, more enjoyable, and easier on the eyes.