[chrisldgk]

No, but the average (read: casual) user isn’t comfortable using the command line to install packages from the command line (and I don’t think SteamOS comes with a package manager UI), so there’s a huge potential install base for users if they could install it via the UI.

[dawidpotocki]

It comes with Discover, the KDE Plasma GUI package manager. You can install Flatpaks using it on SteamOS.