Thanks Justin! So much clearer now on the differences between the Gutenberg plugin vs block editor. I'll be installing the plugin from now on so my themes / styles can stay ahead of the curve.

I've looked, but can't find anywhere that lists which Gutenberg/block features are enabled in any particular version of WordPress core. I have read that not all features from the plugin make it into core, so it's not as simple as saying "WP v 5.3.2 includes Gutenberg 7.1" or whatever. Do you know of anywhere that can be tracked down? It seems like something that would be helpful in tracking down bugs/fixing issues.

Thanks again!