Coming at it backwards
Jackie Chan was a martial artist who fought (on screen) his way into the film industry. Hard to imagine Keanu Reeves becoming a martial artist anywhere near the caliber of Jackie Chan’s
There are obviously those like Gary Oldman, who, unless you paid close attention to the credits list, won’t be able to tell that he worked in the Fifth Element, Harry Potter, and the Christopher Nolan Batman trilogy. Did he learn new skills for the movies he worked in? Most likely yes. Does he retain those skills? Only as much as he practices them or else like in all of us, I’d wager that those skills atrophied away from the moment respective films wrapped up shooting.
If anything, those skills look more like accessories to the critical job of acting on screen.
With the arrival of near infinite phonebooks, the drive and know-how to remember 100s of phone numbers is lost to humanity.
Passwords present added complexity to those of phone numbers. On top of a name to number (allowing a few collisions) passwords are required to be of certain length, contain an upper case letter, lower case letter, number, special character, and more importantly, a preset lifetime.
Password managers seem to be a safer and low stress bet for the vast majority. There will always a few exceptions who can do it all in their head. They don’t tend to advertise their presence.