For me, the most important thing is that I understand the device in order to be able to make settings. A device that offers very good possibilities is of little use to me if I do not understand it and therefore cannot make the settings. The most important thing for me to understand a device is that the interface, i.e. the web interface, where I can set the device and also the app, if I can control the device with an app, are in German. This is the only way I can make settings. It is also enough for me if the device is multilingual and you can set it to German. Unfortunately, there are too many devices that are only available in English. But the time when the whole world speaks English is only coming.