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Open source router firmware project OpenWrt ships its own entirely repairable hardware
(www.theregister.com)
This is a most excellent place for technology news and articles.
WAN would be the Internet uplink port. A 2.5G WAN port is a 2.5 gigabit Ethernet port. 2.5 gigabit and o a lesser extent 5 gigabit Ethernet are a standard that's becoming rapidly available on a lot of hardware. OP is stating that for a device shipping near the end of 2024, a new router that is shipping with only 1 GbE instead of 2.5 GbE is a problem.