Slackware avoids the issue of package management completely.
You just install the entire repository up front, which resolves all dependencies.
If you need software that isn’t in the repo, you can install it any way you like from wherever you like, there’s no real package manager that gets in the way. Usually you compile it with Sbopkg, a helper script very similar to Arch’s AUR helpers. It comes with rudimentary dependency resolution in the form of queue files, which just list what needs to be installed in the correct order for any given source package, and then does it for you.
A more modern approach I follow is to use Flatpaks.