Meanwhile on the serverside, there have only been two versions of state resolution; the original beta version that turned out to be buggy, and the current fixed one which has been heavily scrutinized and is okay: https://matrix.org/blog/2020/06/16/matrix-decomposition-an-i....

The amount of incorrect info in the GP post is very unfortunate - although I too wish that open standard comms protocols spent more time collaborating than spitting at each other.

Yeah, I didn't want to say anything because I'm no expert, but as far as I can tell, Matrix clients use a Rest API. It's not like they are resolving state deltas locally or something. It seems like the big complexity right now is the encryption, since that, by definition, has to happen on the client. There's a concerted effort, however, to make that as easy as possible with shared libraries and such.