Debian and Void (and Void is iffy. The TTY installer is easy enough though, and it’s basically good to go out of the box if you get the glibc iso with Xfce). None of the other base distros are super user-friendly in terms of installation, though I’d add Endeavour OS as an honorary member of the group since it’s essentially Arch with a good installer, a friendly community, and nice defaults.
We don’t install packages without dependancy management, for the most part. We use one of the half-dozen or so pkgtools wrappers made by community members that interface with SBo and handles the dependencies for us (examples include slapt-get, slpkg, and sbotools). Also, Flatpak/Distrobox/Nix etc are all available and easy enough to install if slackbuilds.org doesn’t have what I need (rare tbh).