[TeMPOraL]

Don't make the network a hard dependency. The device should work as fully as possible even if offline.

[aliveupstairs]

Not only should it be offline-first, but it also should have fallbacks options like self-hosting.

[crooked-v]

Also, if it supports any outside protocols (for example: Airplay speakers) those should still work on a totally isolated network out of the box.