Parental controls on the DECO are crap. If my son is using one of the many free VPN he just continues playing when I block sites or the internet. The only way to block the WiFi that seems to work is:...

I have no problem to access that website... What are the restrictions defined for your profile?

Also I see devices on my DECO that never will connect again (e.g my old iPhone that is gone now). So I would would be very happy with a new menu option to delete them.

From a user point of view... With 3 routers having the same SSID, you have 3 WIFI networks with the same SSID. You need to manually switch between the different AP. With 3 DECO's you also have 3 WIFI...