Zigbee is a low power protocol, designed with batteries and it being a mesh network in mind, WiFi on the contrary isn’t (there is a reason mobile phones only have 1 day of battery life (not just the processor and screen), instead of several months for zigbee devices), so even if you have 100M of signal with WiFi, zigbee gets only 5-10 meter (10 if you are lucky).
Plus that they often cause more interference, then that they help each other.
I guess I’m lucky because I have a few Zigbee devices around my home that are being routed through a router device (IKEA repeater) that’s about 20m away (but I’m also lucky that my iPhone 7 lasts more than 2 days on a charge, and that my Zigbee and WiFi aren’t interfering with each other) 
But you also aren’t using Homey anymore 
Het ziet er naar uit dat het verplaatsen van de Homey effect heeft gehad , denk dat ik deze positie maar even vasthoudt voor een paar dagen, en daarna jullie een terugkoppeling geef. iig een iedere alvast hartelijk dank
