IKEAs Trådfri plug can be adopted into anything that supports Zigbee. Works out of the box with Zigbee2MQTT. No flashing required.

No doubt an unpopular opinion, but I’d rather keep the IP rating than be able to swap my own battery without the phone becoming a literal brick.

I doubt this is a scenario where we can have both.

https://www.youtube.com/watch?v=r6l_9reaLz0

https://gizmodo.com/google-removes-nearly-all-mentions-of-dont-be-evil-from-1826153393

It’s been a while since they distanced themselves from that motto.

But you can still buy all the older systems. It’s not like they stopped producing or supporting older standards. Both my local shop and the webshop I use have all cassettes from 7-12 gears. Neither currently has 13 gear cassetes, though.