It is okay, just don't buy anything made by Nintendo unless you're ok with Nintendo's restrictive 'nanny console' TOS. You can run Linux and play GTA and Mortal Kombat on other consoles. Nintendo is geared towards people who like Nintendo.
By providing something like OtherOS, you remove the incentive for that group to crack your console.
It is fairly telling that the PS3 was only cracked after OtherOS was removed.
As I recall, ultimately Hotz managed to compromise the device's root key, and Sony determined that it was impossible to protect the key (after replacing it) as long as OtherOS continued to exist.
Small nit - you probably mean "outside of using them to play Nintendo-approved games" since there's only 2 Nintendo games on the Switch here and 6 non-Nintendo games.
I don't know what you mean here. You can play the latest Mortal Kombat on the Switch, too.