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“There are some parts of Common Core math which might be of benefit to a student who is going to major in math...”

That, in my opinion, has been the major problem with math education even before common core. Math teachers are pretty much self-selected to be people who like and are good at math. They naturally found the patterns that govern how math works as kids and were bored and discouraged by memorization and drills. They want to teach math how they learned it, by exploration and discovering patterns on their own.

But they fail to see that the vast majority of humans aren’t good at math, don’t see the beauty of it and only want/need math to solve the kinds of problems that math can solve. Math teachers want to teach math as they wish they had been taught rather than how the subject needs to be taught for most people.