IMHO, Slackware is close to the local maximum in the space of imperative distros. I think adding dependency resolution is the only thing it misses vs Arch or Void. But like those, it's barebones and it ships simple lean binary packages. Going back to Slackware was a brisk of fresh air when Ubuntu and friends got too complex. Sometimes things break, and it's hard to understand why due to the overwhelming amount of things they ship with.
There's nothing like having total control of what you are running, and Slackware is really good at this.
I think the future are functional distributions like NixOS or GuixSD. For many use cases, they are just ready for prime time. For others (e.g. R or Julia), where heavy patching / wrapping of packages is needed, there's still a bit of work to be done.