I looked a bit into the etymology. It is not helpful. Cook as a noun or to cook means the same thing all the way down to Latin coquus and to PIE *pekʷ-, with only the later having one more meaning: to ripen. Heat application is there all the way, but not really specifying how. I would suggest that probably people boiled or simmered more than they roasted in historical times, because, well, convection, that makes even hardest meat sooner or later soft without burning it, and does not waste nutrients into the grease falling into the fire. For example, if you have an old rooster, a soup or a stew is really the only option.
However, roasting seems to be a higher-prestige way - medieval nobility is commonly depicted feasting on whole roasted animals, not sure how accurate that is. Perhaps the prestige comes from the difficulty. Roasting a whole ox, which was a way inviting a whole town to party, is very, very difficult.
Back to practice: I recommend telling people "learn to prepare a few easy meals" this sounds less scary than "learn to cook".
Perhaps the prestige comes from the difficulty.
More likely from the fact that you roast meat and poultry which are expensive foods compared to grains and vegetables.
This is an extension of a comment I made that I can't find and also a request for examples. It seems plausible that, when giving advice, many people optimize for deepness or punchiness of the advice rather than for actual practical value. There may be good reasons to do this - e.g. advice that sounds deep or punchy might be more likely to be listened to - but as a corollary, there could be valuable advice that people generally don't give because it doesn't sound deep or punchy. Let's call this boring advice.
An example that's been discussed on LW several times is "make checklists." Checklists are great. We should totally make checklists. But "make checklists" is not a deep or punchy thing to say. Other examples include "google things" and "exercise."
I would like people to use this thread to post other examples of boring advice. If you can, provide evidence and/or a plausible argument that your boring advice actually is useful, but I would prefer that you err on the side of boring but not necessarily useful in the name of more thoroughly searching a plausibly under-searched part of advicespace.
Upvotes on advice posted in this thread should be based on your estimate of the usefulness of the advice; in particular, please do not vote up advice just because it sounds deep or punchy.