it doesn't seem to handle debugging in the depth required to really discuss the difficulties of programming, debugging of course can be considered as the process of trying to understand the abstractions but that is generally simple debugging, there is also debugging in finding out how someone else messed up the abstraction they were going for, or finally the interplay between abstractions in different levels of the system that have created emergent problems with the system as a whole that people did not foresee.

that stuff can be pretty hard, sitting around all day getting nothing done, sweating, refusing to move from the computer you're trying to interrogate.

on edit: clarified a point in first sentence.