That’s not really the point. The point this post is making is that third party software is often not available as a package for your distro. It’s been a minute since I used Slackware, but I doubt you can find neatly built tgz slackware packages of Steam or the Nvidia drivers.

I know Slackware has slackbuilds and you can install sbopkg to search for packages and automatically build them, but that goes a bit beyond “just use your package manager”.