Final Thoughts.
We like the fact that Elegant Themes is finally adding these features. Being able to customize all areas of a website, especially the Header and Footer and being able to make them unique for each individual page/post is a must these days. Custom sites are the norm, so in this regard, we welcome Divi 4 and it's theme builder.
With that being said, we feel like ET rushed this feature set in order to play catch up to other page/theme builders. We feel like ET could have done much better and made the theme building process smoother and less clunky. So in the end, we feel like Divi 4 barely hits the mark with it's current theme builder release.
We hope to see ET improve upon the foundations they've laid and that the builder gets better. We still love Divi and would still recommend it's use as a solid Theme and Builder for WordPress.