Is it possible to protect saved games of a particular user from being played by other users, while still allowing them to play all the games they normally can?
It doesn't have to be secure*, so a short PIN code would be fine, and if any non-trivial action is required to run games with a particular profile that's fine too. However, those non-trivial actions should not actually take long, or require an Internet connection.
A typical use case is when there's a party, and you want people who feel like it to enjoy a couple of games, but you don't want to spend time explaining to all guests, kids, guests' kids, etc. that you'd like to resume that Zelda adventure exactly where you have left it.
For those who don't own a Switch, this is how a profile selection screen looks like. Selecting a profile is a one click action which has to be done every time a new game is started.
(*) - by "not secure" I mean a way that doesn't have to prevent a determined person from using my profile anyway. I mostly want to prevent people from picking it by accident, but a somewhat secure way would be even better.