Instrumental rationality for overcoming disability and lifestyle failure (a specific case)
I read things like "Rationality should win!", and I feel validated. That's basically what I've believed as far back as I can remember (and though my memory isn't as reliable as I'd like, I do think it is pretty decent, based on comparisons I've made with video evidence. Not that...
Obvious advice is obvious because it works, yes. The background assumption is that it is all implementable without further advice-wanting requirements. Advice for building a kickass gaming PC in 2017 with secure income and access to the internet will be simpler than the same advice adapted for 1950, because PCs were not available in 1950, the internet did not exist, and computers were huge, slow, and low on storage capacity as compared to 2000, never mind 2017.
Of course, if this could be fully generalized to all contexts, it would likely have been done by now. It's not practical to account for every outlier when responding to a general audience, and even to an individual without extraordinary circumstances (such as being paid as a therapist/life-coach/etc). This is where generalized instrumental rationality should take over, and yet, signs seem to point toward GIR being much harder than ... eh, just about everything short of implementing Utopiae, I guess.