Now this is in the US, but I've met and worked with numerous absolutely top quality teaching professors and they had a disproportionately positive impact on their students. Many of them were happy and well adjusted and did not seem in much more of a precarious position than any other person I've met working a job for a similar amount of money in a field they enjoy. Obviously, it depends on the college, how well compensated you are, etc. But as far as I can see, the only thing that's absolutely worthless is sticking a top tier professor in front of a class of undergrads and forcing them to teach a low level class while simultaneously splitting their attention between twenty other responsibilities.
The nature of a 'teaching professor' job can vary a lot, but the positions are often very precarious and unstable, as I can attest from personal experience.
I think you may have misunderstood my point. Being a great teaching professor is an invaluable contribution to students lives and the world, but it is “absolutely worthless” as far as promotion and tenure is concerned.
My point is not “don’t respect teaching profs”, quite the opposite in fact: Recognize that the teachers that had an impact on you in university that had an impact on you not only to no career benefit, but potential to their own professional detriment.
Same goes for truly great technical managers. All the technical work they enable is through their own personal devotion and at best causes no professional growth, at worst takes away energy that should be spent elsewhere.
"Managing down isn't actually that hard to get the hang of if you have strong technical skills and reasonable communications skills. But managing down is very similar to being a good teaching professor: absolutely worthless and largely done at your own peril."
If your reply above is what you meant to say, that was not at all clearly communicated.