It’s simple and solid enough to give to people who don’t know what they’re doing, and its Debian/Ubuntu base makes it flexible enough to not slow down power users who want to start modifying it. Other distros that might fit this bill keep shooting themselves in the foot and going off in weird directions, while Linux Mint has been a reputable no-BS distro for a very long time. It’s a workhorse distro without any gimmicks and that’s the point.