Great list of good points!
IMO a big problem of Medium is also, that the whole platform is too focused to US-content. As a German user you have to accept that the feed is full of Donald Trump and American politics, which is of no interest to me personally.
I also think that it should not be a big problem to translate the platform into other languages, so that it is also possible to run a German blog here, for example, without confusing the readers with English labeled buttons. I wrote about this some time ago.