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First Router Designed Specifically For OpenWrt Released
(sfconservancy.org)
This is a most excellent place for technology news and articles.
The gateway device should definitely be up at all times, but in the real world, things don't always go as planned.
If you only use the internet, then maybe having your AP go down when your gateway goes down is fine. For us avid self-hosters, that is unacceptable behavior.