I wonder if the UnRaid team has figured out an easier method to take care of dependencies, considering they run a webserver with considerable assets on Slackware.
Slackware will always be a consideration for me since I do not like systemd
(philosophical reasoning), but yes, managing dependencies manually is a pain and said pain grows with almost every package that one installs and then needs to upgrade. I wonder what was the motivation for the Slackware team to not include automatic dependency management to their distribution, which would likely have been my choice for lean and stable distribution over Debian if it had that feature.
If i remember right, it takes a lot of resources to maintain a package manager, and the focus on slackware is to be on the improving the distro overwall hence its superb stability. Community members have created sbopkg + sbotools to create a 3rd party package manager if you want to go that route on slackware. Sbotools would be the gui to take care of depenencies