[gh02t]

They sort of do, the official KiCAD part libraries are actually hosted on Github https://kicad.github.io/. A lot of distributions kinda mess this up by distributing static snapshots, but I usually clone the Git repo and then direct KiCAD to that. The base libraries cover a ton of parts, and I then keep all my self-drawn or individually downloaded parts in a separate library.

It's still a pretty clunky workflow but it gets the job done. I really wish it was possible to have a point and click interface in the GUI for downloading individual new parts akin to a Linux package manager, but this is probably difficult to manage since there is no centralized distribution point for parts that are outside of the official libraries.