How is keeping Arch up-to-date hard? Because there are a lot of updates?
I found Arch to be easier to maintain than any other distro I use. Everything is managed by the package manager ( no snaps, no flatpaks, no PPAs ). Updates are frequent but small and manageable. There are really no update “events” to navigate. And everything is current enough that I never find myself working around missing features or incompatibilities. I found it to “just work”.
I am not sure how your first point relates to SElinux. SELinux is part of the Red Hat ecosystem which is why Fedora uses it. It is not new ( SElinux may pre-date Arch Linux ). Whether you have it installed or not has nothing to do with how hard the system is to maintain. Default Debian installs do not use it either. Most Linux distros don’t. Ubuntu and SUSE use AppArmor instead.
I do not use SElinux on desktop but it makes sense for a server. The Arch kernel includes SElinux support so all you have to do is install the package if you want it. Generally, Arch gives you a newer version than Fedora does.