its because it takes way more perceived effort and way less people are willing to climb the enormous mountain of working a complex highly educated job.

But anyone can do blue collar work (as long as they are physically able) so the people working those jobs are less refined. They dont have as good soft skills, social skills, etc. But they are still good at solving problems and as you said they are essential.

Ive worked blue and white collar and they both have lots of pros and cons, but white collar is much better once you are experienced in your field