This was a good, balanced conversation about Gutenberg, and what it means to WP and the community.
Disclosure, before making further comments: I'm a member of the founding committee of ClassicPress.
Re: the community split, it's been building for a few years as WP made more and more plain that it would cling to it's blogging roots at the expense of a growing CMS-driven portion of the community. Gutenberg was simply the last straw that made many of us (who also love the WP community) realize we had to find our own path and create our own community.
ClassicPress hopes to preserve and build on WP's CMS legacy that it is, IMO, abandoning. WordPress is to be lauded for choosing to serve who they see as their core user base; it just doesn't happen to include me or anyone who uses WP primarily as a CMS. I will say I don't think WP handled the decision to make Gutenberg part of core in a way that reflects its publicly stated values, but that's an entirely different discussion.
Many of us at ClassicPress still hold WP in high regard, and we see no reason there should be ill will between WP and CP. Fundamentally, we server different markets, and I hope both projects thrive. I think the two communities will find themselves overlapping for many years.