Teachers get on special educational programmes that have lighter requirements. For example, they don't get a math degree to teach math. They get a teacher's degree to teach math.
It isn’t weird that someone teaching K-12 math would learn to teach math to kids rather than focus on advanced math that they would never need or use for their job. Considering that even the most advanced math class in high school usually is a first or second semester class in university.
Teaching is a different kind of hard I guess, I wouldn’t say it is easier, especially for those of us who aren’t great at training up soft skills. I’m glad someone can make a good career out of it, I don’t think I could.