The idea that you can actually optimize your thought processes using deliberate rational will and analysis of biases, as exemplified by the home page,

How are you distinguishing an affective death spiral from people thinking that something is a good idea?

and specifically the extreme version of this idea that some users try to adopt.

People using Anki and Pomodoros (neither of which were invented on LW or by LWers) doesn't look extreme to me.