I have a writefreely instance for myself and like it. I would like a static site generator much more, because I can edit and view my blog offline, but I like that writefreely uses Activitypub and I wanted to have that explicitly, so here we are.
It does it’s job though and is usable for me. I normally prepare articles in a markdown Editor offline and just copy them into the web editor.
(Just to mention it:) writefreely only publishes articles via Activitypub but does not have a way to view replies on an article (yet?).