Hi, I strongly agree with your article. That's why you should look at WIRE https://wire.com/ a messaging app providing end-to-end security for text, voice/video call and transfer files. Please review it and add it here. It's far better than Telegram has you don't have to enable secret chat in Wire, all is already secret chat by default. It's multi-device and multi-plateform!
I personnaly use it since more than a year and said goodbye to Skype!

By the way, you also have https://meet.jit.si/ video chat in a browser without registeration. Ideal for a one shot conversation.