This is a big lol. If plugin authors have no idea how gutenberg will end up being to be able say by themselves if the plugin is compatible, how will random people be able to do that.

My favorite stupid entry in the DB is related to the search and replace plugin, claiming that since it does nothing with the editor it has to be "ok", but since the search and replace is textual and GB adds a lot of garbage comments in the content, it is very likely that search and replace as it works now will break some of you content, and this is also a concern to probably all plugins which combine backup with migration.