Recently bought an apple watch for my mom and got it set up with her iphone. Almost instantly she notices that she cant accept WhatsApp calls on her watch, and after looking into it I found out that it was another one of those apple things where they assume youre obviously using facetime so that functionality isnt available for any other app. For context, in europe Whatsapp is the dominating messaging app and alot of people use it for calling as well as messaging. The apple watch is, as far as I can tell, a simple Bluetooth wearable with a speaker and a microphone, so the only reason its like this is that apple has a concept of how the device is "supposed" to be used and only lets you use it that way. After that experience I fully support all the regulations the EU is putting on apple to open up.