The use of "beating" implies that there was a competition, and indirectly that this "convergent" attribute is somehow worthwhile.

Which isn't demonstrated, so you might want to address that...

I love DEX but it's not truly ready for be used as an everyday OS. I wish Samsung would devote more resources into it though. I've always loved the idea of unified computing and the phones in our pockets are really some powerful machines.

I suppose they do not consider it a ‘truly convergent operating system’ since you cannot (officially) get root on it.

Can you get root on vanilla Android or iOS without jail-breaking, though? That seems generally true irrespective of the convergence factor.

Yes, so the point is that people who care a lot about such things may not consider vanilla Android or iOS to be ‘true’ operating systems, but rather a sandbox with limited functionality.

Bingo! I don't consider my phone a 'full computer', it's more like a 'computing appliance'.

There were things before Dex even, but I guess they're talking about the OS vendors.

I've tried Dex as a daily driver. It's unusable. It's slow, doesn't have customization options nor sane defaults. Alt-Tab is extremely non reliable. I ditched it.