I agree (or am rapidly beginning to) that Harrington's tournament concepts can be a little rigid. I'll read it again however to see if my own feelings about it all have changed.
Dont take one persons word as being gospel - as you will probably find when you read all the posts on one thread there are so many different styles to the game that what works for one may not necessarily work for another, so just because one book tells you one certain concept or style it may be that the style in question doesn't suit your natural style and approach to the game.
Ask the same question to 10 different players and you may well get 7 different answers - its about then taking all the best bits from those 7 answers that would suit your game and going from there.