Like WordPress, Wix needs to have an optimization tool like WP Rocket in order to increase the page load. I did not add the link here. The developers have already better ideas about it.
Also, Wix needs to consider to enhance the blog editor, too. Like Editor X, the blog needs to have sections. What I mean that we could add some gallery elements, Dynamic HR, Dropcap, pre-designed texts, call to action button, etc. I mean, like a new WP editor, Wix could add some superior, better things to the blog.