This goes with calculator to do basic math, contacts apps to store phone numbers instead of remembering them, and watches to tell time imo.
Sure we could use our brain power with old techniques to do these, but why? I don't want to do any of these. I'd rather use that brain power for other problems.
Same with maps.
I don't want to have to store a bunch of location or routing data in my head.
I think what you're pointing towards is going from having problems to solve to not having any problems to solve.
That's definitely a danger, but right now is still early in the AI era so obviously it'll feel like we went from solving problems to letting the new tool solve them for us.
These "secrets" that are being hidden are basically on the same level as gary tan's list of super uber powerful prompts.
None of it is actually that crazy that everyone else could think up.
What I've noticed in my own experience here is that even when I do share my own prompts/skills few people use them (or alternatively they were so basic that everyone already had their own version).
e.g. If someone doesn't care about xyz before AI, they probably won't after AI even if I serve them it on a silver platter.