Exactly, keeping components separated, especially the router.

Hardware routers “cost money because they save money” (Sorry, couldn’t resist that movie quote). A purpose-built router will just run and run. I have 20 year old consumer routers that still “just work”. Granted, they don’t have much in the way of capability, but they do provide a stable gateway.

I then use two separate mesh network tools, on multiple systems. The likelihood of both of those failing simultaneously is low. But I still have a single failure point in the router, which I accept - I’ve only had a couple outright fail over 25 years, so I figure it’s a low risk.