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First Router Designed Specifically For OpenWrt Released
(sfconservancy.org)
This is a most excellent place for technology news and articles.
Yeah, you'd use the 1G port for uplink and 2.5G for internal network use, assuming most of your traffic is internal (e.g. streaming from a NAS or something).
But yeah, the port setup is weird. I'd honestly rather have all 1G ports and have more of them (w/ active PoE) than a single 2.5G port.