There are some really basic features missing in the Deco M9 

1) Ability to see and control which units are connected to which individual Deco - This is especially important for me to determine is my security camera is connected to the nearest Deco unit or not. The wifi performance for my security camera has deteriorated because it is not always connected to the nearest unit. It keeps switching over to other Deco units and therefore I experience higher interference in my Wifi signal. I can see this because the wifi signal health varies at different times during the day. And I have no control on the app to make sure that my survelliance camera stays connected to only the nearest unit. 

2) Web based interace to control and configure the Deco Wifi router. I am having to always use the limited functionalities within the app to configure the Deco router. 

3) Ability to create a 2.4 Ghz and 5 Ghz network seperately instead of a the same SSID for both networks - This is important so that i am able to choose which network I want my devices to be connected to.