usenet is similar, yea. messages sent between servers. but not much to differentiate between servers, though. different instances here have or are developing their own ‘personality’ or focus, which didn’t really exist among usenet servers.
i think lemmy and the ‘federation’ is more like the old fidonet from the days of dial-up bulletin boards. posts and other content get sent between instances like echos and echomail did between bulletin boards in fidonet. each bbs was different and had different features, user bases, etc, and most had a theme or central topic of some sort. some were multiline with chat and multiplayer games (tradewars anyone?) sysops chose whether to participate in fidonet, and which echos they carried. fidonet also had netmail (a kin to email today) and networked file distribution.
i agree with opting for a desktop pc over a laptop here in this case.
the phone’s worked for them for a decade, so i don’t think portability is needed.
with being chained to a desk and chair for health reasons when using the pc, there’s no point to a laptop other than for portability (which isn’t needed)
it will be easier to configure the work space, and offer more flexibility on display size and quality.
a traditional desktop is easier to work on if something goes wrong or hardware upgrade is wanted down the road.
firefox does utilize the lesser version of these google-provided services by default–how it works
most phones these days are an mp3 player. even my flip phones back to my first cdma one ~ 20 years ago.