> they lack basic features like multi-device sync I've never used multi-device sync, ever. Not on iMessage, Viber, WhatsApp, ... The only one that I use across

> they lack basic features like multi-device sync I've never used multi-device sync, ever. Not on iMessage, Viber, WhatsApp, ... The only one that I use across devices is Skype, but I don't use it except for video.