I agree on the coffee machine. On the thermostat, not so much. We keep pretty irregular hours so being able to control the thermostat remotely, so the house isn’t being heated unnecessarily but is warm on our return, is useful.

Honeywell Home T6 Pro Z-Wave.

It's smart and supports only Z-Wave, not WiFi. So something like a machine running Home Assistant must sit between it and the Internet. And then its up to you to decide how you want to do remote access, but WireGuard overlay networks (e.g. Netbird, Tailscale) basically solve that problem at home-user scale.

That said, getting a Zigbee or Z-Wave thermostat and have Home Assistant or similar control it is a better option that buying a surveillance-ready WiFi-enabled one.