I could think your entire post might've been written by me if you replaced Slackware with Arch. I haven't tried Slackware, but this makes me wonder how similar it is to Arch.
What do you mean it's missing dependency resolution? Do you need to install dependencies of packages manually?
Out of the box, you do have to install dependencies manually, but you don't have to track them, which is the part I would dislike about dependency resolution. Assuming you have a full installation (where all dependencies will be met), and you find your package on slackbuilds, dependencies will be listed and can be installed with about the same ease as you would install a package on, say, Debian.
What do you mean it's missing dependency resolution? Do you need to install dependencies of packages manually?