I have been eagerly awaiting the moment when I could install a theme and truly test Gutenberg’s full-site editing feature. By and large, each time I have tested it over the past few months, the experience has felt utterly broken. This is why I have remained skeptical of seeing the feature land in WordPress 5.6 this December.
The Q theme by Ari Stathopoulos is the first theme that seems to be a decent working example. Whether that is a stroke of luck with timing or that this particular theme is simply built correctly is hard to tell — Stathopoulos