If nothing else, then to have a reference to whom else not to befriend, and to have a known source for all the hottest new nonsense.
Kinda like Urban Dictionary. Lots of degenaratory stuff on there, but at least i got somewhat reliable definitions for all the weird stuff people call me and/or each other.
Used mine as my main PC for half a year, doing everything from gaming (duh) to embedded development. Used RWFUS to install packages not available on flathub, but have recently started experimenting with the NIX package manager (I’m still running write-protected SteamOS).
My sister uses hers as a test and development machine for linux and Android applications.
Thought about using my SD in my model aircraft hobby, but never got around to that. Maybe I’ll use it when playing around with my car with the OBD2 adapter, since i can easily connect to it from my current main rig.