Silly debate, truth is in the middle. Computer analysis might help a novice spot blunders that they would miss with their own analysis, which surely has at least some small value. But the value of receiving human help is so much greater - novices make such basic mistakes that a few human words explaining general principles has many times the value of the computer.
To get back to the original question, how deep one needs to look depends a lot on the position...if you can't see to the end of forcing moves like exchanges and checks, that is very limiting. In a position without forcing moves, novices tend to get into flights of fancy very quickly, which there isn't much value to.
When checking one's own game analysis, against that of a chess engine, how many moves deep does a novices or even Class D player really need to consider?