I think the problem with practising rationality as on LessWrong is that people end up not doing perfectly rational actions and strategies the rationale behind which they did not understand or had explained to them (usually people pick those up from environment without the explanation attached). Furthermore intelligence (as in e.g. ability to search in a big solution space for solutions) is the key requirement as well, and intelligence is hard to improve with training, especially for already well trained individuals.
I think the problem with practising rationality as on LessWrong is that people end up not doing perfectly rational actions and strategies the rationale behind which they did not understand or had explained to them (usually people pick those up from environment without the explanation attached). Furthermore intelligence (as in e.g. ability to search in a big solution space for solutions) is the key requirement as well, and intelligence is hard to improve with training, especially for already well trained individuals.