Shelly devices can easily be set up to not use the manufacturer’s cloud, which the author of the article apparently didn’t disable, since he uses their mobile a

Shelly devices can easily be set up to not use the manufacturer’s cloud, which the author of the article apparently didn’t disable, since he uses their mobile app. When that cloud service is disabled, some more developer-friendly protocols are able to be used, like MQTT, which makes these Shelly devices as future-proof as the other standards you mention, and MQTT libraries and clients are easy to find. The only bad part is that the manufacturer’s firmware for Shelly products does not support TLS; it is possible to flash other firmwares which do not have this limitation (Tasmota). (I have a bad experience with Shelly devices, but they made me love MQTT.)