It's "incredibly simple to use" only when the asynchronous use case you describe is desirable. Consider this very basic use case: my mom and I want to be alway

It's "incredibly simple to use" only when the asynchronous use case you describe is desirable. Consider this very basic use case: my mom and I want to be always able to call/interrupt each other. - Skype fits the bill: I just double-click her name in the contact list. She hears the ringing, and answers. - WebRTC-based services do not: I have to generate a link, email it, and hope she sees the email (she won't) then join asynchronously. Put dryly, basic WebRTC-based services like Hello lack the notions of a contact and a presence mechanism. That's a deal-breaker for my use case. EDIT: I see you mention "services surrounding video calls, for example a contact list". Agreed, but to me it's more than an additional service, it's a core feature.