One problem with WordPress in general is that right now there are no prominent devs that champion its CMS features. Scribu, the guy who did the amazing Posts 2 Posts, left years ago, so right now there's no core dev campaigning for features useful for non-blog sites. Correct me if I'm wrong, please.

So, now we have this new editor who will treat custom meta boxes, the foundation of most client work, as an afterthought. All kinds of data, ranging from products to events, including more complex content types in which the description is not the most important part, risk being treated like second-class citizens with Gutenberg.