It’s really neither much too nor very complex at all. I have a home lab stack of mini PCs and raspberry pi’s in my office hooked up to a switch to my router. Among the stack is an intel nuc with a few attached usb hdd, sharing those drives via NFS and Samba and hosting Jellyfin. The same machine serves jellyfin to my other devices and a few family members over the internet. That machine is more than capable for the task. In order to get that media to the living room I have a raspberry pi 4 running libreelec also hard wired to the Ethernet also to the same switch (running through a cable window in the wall). No, I had not heard of the issues with flat Ethernet cables that are otherwise advertised as cat 7 compatible, because I have (some) of the machines networked with flat Ethernet cables. Those are getting replaced.

For the most part the pi4 libreelec machine handles content fine. But I have a number of multichannel audio, hd not-quite-4k animated movies that do routinely cause buffering issues. It seems most likely upon review and after the comments in this thread that it was a simple bottleneck at the pi4. The same content plays unstuttwring on other more equipped machines on the network. I do think the router is on its way out though and deserves an upgrade but that looks to be an optional next step. I’m replacing the pi as a media machine for now.