Got a few hours to tinker with some of the distros. Here is my results:
Devuan-Installed and worked pretty well until I dropped in a custom build kernel, then the desktop cursor would freeze for a split second every few seconds.
Void-Installed and seemed to work fine until nftables reported lib mismatch error. Also the fluxbox desktop toolbar has a display glitch when setup on rightcenter with autohide.
Ubuntu-Didn't make it past the installer because the menu didn't want or accept an existing UEFI partition.
FreeBSD-Installed and worked fine, but the VGA firmware never allowed starting xorg.
Artix-Installed, but seemed to blend in Arch's repo just to get additional packages, but eventually found out numlockx wasnt even in any repo.
Rocky-Installed, but found out it was for enterprise and didn't have fluxbox or some other popular softwares.
Venom-Installed but failed to build fluxbox.
Arch-Installed and seemed to work, but now an 1.5min timeout error shows every time I want to shutdown.
Bodhi-Installed and still functioning on my system.
Gentoo-Works as always.

Interesting. Would be even more so if you included a full spec of your machine.

systemd does that when it is waiting for a process to shut down which does not shut down.

Typically the process that fails to shutdown is one that failed to start in the first place.

Default timeouts can be adjusted via /etc/systemd/system.conf. I've been replacing 90s with 7s on most of my installations.

Something wrong with your compiling(?) - I've been using Devuan for a few years now, with no glitches whatsoever.

Found out there was a bug in arch package desktop login manager that was causing the 1.5min timeout. After uninstalling that it worked fine.
Found out the Devuan linux firmware is OLD and was causing the mouse glitch issue. Issue went away by upgrading to the testing repositories instead.
Artix looks like they moved the arch repos into universe which means its now a virtual compat with systemd, which now included the numlockx packages.
The Void nftables issue was from a missing package which i installed and worked fine, but the strange glitch issue with fluxbox remained mystery. I'm guessing its another firmware issue, but I will not be persuing that any longer.