If you use a robot vacuum, it might help to get one without a camera, only Lidar.
(I also made a point of buying a smart tv without a microphone, but it was already hard to find one in 2023, I imagine it's even worse now.)
E-ink devices: I think you can put all of them in flight mode, at least that's what I do, and upload books via USB cable. No need for network features.
Speakers: Just buy a cheap and basic wired one?
Smartwatch: How would one work without telemetry? It's kinda the whole point π€ I guess you can try to replace the software with Gadgetbridge.