Pyramids are the perfect analogy to disprove your point.
The pyramids were useless tombs that wealthy kings wanted because of religious beliefs.
As an engineer, I have spent many months building features that were disabled/deleted because the measurements showed they were no good after release.
Now, for the 1% of product managers who make the right call every time on their own, having an engineer participate in the discussion may be a burden. But in my personal experience, every product discussion I'm in I bring great value to.
The pyramids were useless tombs that wealthy kings wanted because of religious beliefs.
As an engineer, I have spent many months building features that were disabled/deleted because the measurements showed they were no good after release.
Now, for the 1% of product managers who make the right call every time on their own, having an engineer participate in the discussion may be a burden. But in my personal experience, every product discussion I'm in I bring great value to.