craig -90% or more of the top coaches will tell you to gameplan. My alias, Oldresorter, is one of the more famous coaches known for set and forget. That is not exactly accurate of what I do, I actually teamplan very hard, in order to get my distro, shot selection, depth chart and fatigue settings 'right' for any particular team I coach.
What I feel is dangerous, is the notion, that large changes to the game plan, like moving a guy taking 3% of your team shots to a large distro number, or moving the starting SF to PG in order to get the right defensive matchup, can be very dangerous for the newer coach (and even some vet coaches).
If 90% of the coaches would tell you to gameplan, here is something I'm 90% sure of, there is a set of 'right' ways to go about running an HD team, that maybe 10% of the coaches who play the game know, such that those coaches tend to win more than the others, that extends beyond 'high' rated players (I say high rated players, because I think there is also 'right' rated players, which is an edge the best coaches have over most too).
I don't know who this d2 guru is, but my guess is he does many of the right things when he 'teamplans' for the set and forget season, that he has in common with girt, or lostmyth or aejones or billyg or etc, etc, etc. I often see those 5 give advice that is different than each other, or different than I might give, yet, at the end of the day, I'm pretty sure much of what they do is consistent from coach to coach.
So don't get real caught up on if -3 or -2 or -1 or +1 might be ideal, or fast or normal or slow for any given day to the exclusion of what might be best for your team, game in and game out, in terms of team and ind settings. Only once you get the set and forget stuff right to set a baseline, can you really adjust game to game well, especially as a newer coach. I still look at things trying to get my baseline setup right for each team as the most important part of pllaying this sim, and I have coached as many or more games than anyone, some might even say at a pretty high level.
Hope that helps.