Page Builder Lock-In
Elementor and Divi produce markup that only makes sense inside their own ecosystem. If you want to change a font, move a section, or add a field, you open the visual builder. Your templates, your layouts, and your content are bound to that tool. If the plugin stops being maintained, or the developer who built it leaves, you have a site that no one else can edit cleanly. A custom theme has no such dependency. The template files are plain PHP. Any competent WordPress developer can read and extend them.