Google docs also uses OT not crdt. OT is easier to develop by an order of magnitude and even offline mode is possible to implement in a good enough way.

Nice blog post, but I really wish the author knew how to use apostrophes. (Or the difference between its and it's, if it's not the typographical character he doesn't like.) It's just so jarring to be reading along and be tripped up all the time with grammatical mistakes.