With Gutenberg on the horizon, this plugin should prove to be quite handy for those of you looking to adapt existing sites to the new experience. Gutenberg Ramp, a project of Automattic, allows fine control over where you are loading Gutenberg. I've done some testing with it and all is ?!
With the base install of Gutenberg, it only loads on standard posts. At the least, this is an easy and quick way to enable Gutenberg for pages. At its most powerful, it allows you to identify specific post ids and other CPTs on which to load Gutenberg.