Following a fully logically valid set of inferences seems extremely inefficient - we need to make decisions constantly and relying on short hand for most of those seems perfectly rational - it's rational to trust irrational gut feelings for most unimportant decisions because trying to fully prove all actions is a fool's errand.
I think the article is more focused on those big decisions where rationality is certainly warranted and so often ignored. People who are highly skilled at life have developed their gut feelings and instincts to be able to determine which decisions they really need to sit down and think hard about and which ones they can mostly ignore. When most people buy their first house the decision is so immensely large and represents such a high value (more than half a million at least for a lot of city folk) that there is a desire to detach from it to free yourself from responsibility - since you cannot sanely account for all factors it is "safer" to protect your ego by delegating the decision entirely on your id - doing so allows you to, post de facto, entirely free yourself from any responsibility of your poor decision. This, I think, is the main factor we need to fight against to make rational decisions - you must accept failure and be willing to be wrong without shame. Do your best to evaluate your options on important decisions and realize that there are a number of decisions you obviously can't fully rationalize out - you can only make your best attempt. But realize that making your best attempt and being wrong - as much as it might hurt your ego - is a better alternative than "letting it ride" and being able to stand blameless on the far end.
The fight for rationality is mostly a fight against emotional fragility and intellectual laziness.