there's no need to stick to dumb devices, especially when new devices have much better hardware. just dont connect them to a network unless they're VLANed, pi-holed, or even MITM'd with filtering.
Personally I don’t think the benefit of smart devices outweighs the risk of not keeping them “VLANed, pi-holed, or even MITM’d with filtering”.
What are the benefits anyways? Not having to physically get up and flick a light switch anymore? Getting a push notification from my fridge that we’re out of milk? Whyyy?