[mehrdada]

I think this can vary across people/projects and perhaps true in a large number of cases (this could also be said for the management in business, and it is debatable whether spending time on the ground doing the actual thing would always be the most leveraged thing one can do). Irrespective of that debate, at least for this particular instance, I can confirm that the professor in question himself [who happens to have been my doctoral advisor :)] went through a whole lot of trouble personally, down to reducing many many individual bugs and you can just look at the bug tracker activity under his name to independently verify. (I have long graduated so this is not a "paid Glassdoor review" either and ran into this as a frequent HN lurker!)