I think there's too much siloing between, say, STEM majors and Liberal Arts majors. You get Philosophy majors who are pretty good with concepts like confirmation bias (just for example), but super bad when it comes to things like "why is the sky blue" and "just what is the Internet, anyway". Conversely you get engineers who are pretty good programmers or EEs, but really don't understand things like "Affirmative Action isn't racist" or "taxation isn't government theft or class warfare".
I... mostly think high school is useless? I guess it's more accurate to say I think middle school (6-8th grade) should be more like high school, and high school should be a lot more practical, applied learning. If you're interested in cars, do that. If you're interested in chemistry, do that. Do them both at the same time, and do some music too, whatever.