I think that any conversation that says “everyone must …” is problematic. In regards to hosting, I always come back to Mike Caulfield’s post about the problems of running your own server. I have not changed my stance from a few years ago, I would recommend anyone starting out to begin on Edublogs and move to their own domain if they so wish. One thing that I would warn people about though is a space like Medium where the ability to move is not necessarily clear. Still happy that I move to Reclaim and away from Blogger.