any app/tool/etc. that's "designed for the average user", will only help its user be(come) average and below average!
Now try imagining selling a product with the slogan XYZ - Helping you stay mediocre, and even drop below the average! Use us every day, keep greatness away! ...if you're doing data-driven-product-design targeting the "average user", you're building just such a product
Let's take robots on assembly lines: If it's used to free up the workforce for more creative work, say, controlling production, making decisions about it, finding creative ways to act and so on, then it's to the good. If it's used as a device to maximize profit and throw people into the trashcan, then it's not good.