When we bought our house last year; it had lots of coax and telephone outlets, with conduit in the wall connecting them. I have no use for these outlets, but the wall boxes and conduits can be repurposed for Ethernet cables 🙂
I got a Unifi 16XG switch, it was too loud. I made it quieter using Noctua low-noise adapters.
I’ve recently upgraded the network infrastructure in our house. Went all in with Ubiquiti UniFi, it’s pretty sweet.