That, I would say, is a very narrow idea of rational decision-making.

Well, yeah. I did say it was a very basic step, not a fully-vetted rationality method. But making a list of pros and cons is better than making decisions based on emotions or impulse and it's common enough that almost everyone is familiar with it. And it's a place to start teaching people how to do it better. The only other non-corporate examples I see here are "making lists" and "nigerian scammers" which are also very basic. I feel like it answered the request which was for "rationality techniques that have already become commonly used in the general population".

If the general population already had a lot of really good rationality techniques in common use, this wouldn't be an interesting discussion.