Industrial designers had a huge hand in creating almost every object that surrounds you including the phone, monitor, keyboard, mouse, etc. that made it possible for you to write this post lmao. It's not a bullshit field whatsoever.
Nobody who actually knows what they're doing buys these sets because you eventually realize you use certain colors a lot and barely touch others, so you typically end up buying individual pastels, paint tubes, etc based on your actual needs as an artist. And sets are often filled with cheaper crappier versions of a brand's line, like they might include hues (imitations of expensive pigments made by blending cheaper ones together, which usually don't mix very well) instead of the real thing to cut costs.