The whole point is the freedom of choice. I don't use Arch because it's "one of the hardest most customisable distros", but because it's rolling release, I like pacman as a package manager, and the AUR is a great resource. I used Ubuntu with bspwm and Arch with Gnome, and there's nothing wrong with either of those setups. It's all Linux in the end. Most of the differences between distros (for most "traditional" distros, at least) boil down to the install process, the init system, a set of default configurations/packages, and the package manager.

Don't play gatekeepers, please. It's dumb, nobody asked you to do it, your opinion is just that, and it's exactly this type of community behavior that turns people away from Linux. Thanks.

Kinda weird to categorize distros into difficulty levels especially when they're not particularly difficult.

Every distro that isn’t immutable is customisable, that’s the nature of Linux. For example don’t like cinnamon on mint? You can install another DE. Arch alone isn’t customisable in of itself, Linux is.