I started to get the same sense, and remembering a couple of the following things have helped me keep my bearings:
-Startup advice, especially from this corner of the world, applies to a very specific way of creating a software company through venture capital, and subsequently, aggressive growth. It is also built to take advantage of a highly optimistic financial environment that, to me, seems to be temporary (look at VC's performance as an asset class).
-The main purveyors of "startup canon", if you will, just so happen to directly benefit from more people taking their advice and entering the startup pool. In the most jaded view, Graham and the like's advice/essays/mantras are propaganda that, if more people listen to, directly improves their portfolio. I don't go quite that far as a lot of the advice is sensible and experience based, but it's really important to remember that their advice isn't philanthropic.
-Finally, startups are just businesses. The entrance of venture capital into the equation suspends the normal rules of business for a while, but eventually they do return. And while the way software allows people/companies with little to no capital attack large markets is unique, I feel like a lot of founders would do well to broaden their perspective beyond the relatively brief history of silicon valley when looking for insight on guiding their businesses.