my grandma taught me about most safe and unsafe shrooms in the european forest, and how to see safe from not safe - but i was always scared to apply this here, i was told many times that same mushrooms that looked safe and familiar to european mushrooms here are not the same at all. we have some friends who do mushroom hunts all the time, one couple actually got hit once with a minor poisoning. but as a survival skill, i would 100% agree - it is a very useful thing to know.Otzi, the 5000 year old iceman was found in the alps carrying two mushrooms; the birch polypore and the horse hoof. Both are edible, extremely medicinal and can be used as tinder to start fire.
If you believe a portable medical kit that you can also eat or burn is a wasted effort on your quest to survive, so be it.
There are many, many more dangerous plants you can consume that will kill you than there are mushrooms.
Don’t confuse your familiarity with the plant world as safety. You must be absolutely sure what you’re doing regardless of the kingdom you consume.
as of nutritional value - you do use them in the soup, you fry them, and if you know at least a basic of how to find them - they are everywhere. just need to know what is safe and what is not. which is a bit of a trick.