Continous Conversation / IM Roaming across devices

Why hasn't SfB provided the ability to continue conversations across multiple devices with chat/content history displayed. This seems like a no brainer and its apperently something that people have been asking for for years. 

https://www.skypefeedback.com/forums/299913-generally-available/suggestions/9769296-the-conversations-should-load-with-the-history-aut