Would there be any economic downsides to having the vast majority of high school graduates be functionally literate, scientifically literate, and able to think critically?

It is said that many conservative voters are vulnerable to disinformation, which leads to election of politicians that promote regressive policies. However, if everyone was smart by the time of high school graduation (by improving the education system, getting more parents to participate in their children’s education, removing obstacles in education, etc.), would there be a problem filling jobs where tasks are repetitive instead of frequent problem solving but difficult to automate? Jobs like janitorial work, assembly line, etc. I would think smart people would have a difficult time feeling fulfilled in a job which may bore them.