It's kind of there now - you can link devices, but you have to manually switch between them. So only one device is active at a time. Not what people are looking for, but it's a start.

Not really useful for me, yet, but I like their approach. They didn't just throw out a fully-functional use-anywhere but flawed system, just to appease users. They've remained focused on keeping it secure. It's an Agile development approach, which works really well for stuff like this.

My guess is it'll be more fluid within the year (at least I hope so). I'd really like to switch to it, especially since you can self-host. Would be useful for my family, and could possibly make getting friends on board easier.