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It’s useful but not necessary. It’s hard to offer the simplicity described above while keeping the control in your hands, but some folks working on wireless mesh are working on it:

https://blog.eero.com/mesh-trust-public-key-infrastructure-e...

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"Simplicity" can be a negative indicator of security. If it's simpler for you, it might also be simpler for an attacker.

Manual steps with the physical hardware, or even requiring a local wifi/ethernet connection, are always going to be more secure than an internet-accessible god mode.

Could you be more specific regarding why it's "hard"? I reject the premise that such a limited feature set can be "hard" to support without "cloud". Seems like some combination of NFC/QR codes, WPS and Android/iOS ought to be able to do the job. Mesh set-ups are known to work just fine on-prem. Moreover, a fully local system will almost certainly be more reliable, and will last longer. Certainly beyond the date when Google inevitably cancels the project on their end.

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