@Olfader 

Google Home can manage and integrate smart devices from different brands because both brands are compatible with the platform. Tapo Smart Action is a feature developed by TP-Link, meaning that if a third-party brand does not support Tapo, its functionality cannot be utilized. Currently, the Tapo app only manages Tapo and Kasa devices and does not support devices from other brands.

Have you come across any smart device brands from different companies that can directly support each other, rather than relying on major third-party platforms like Alexa or Google Home for interaction? I don't recall seeing any?