Well of course, it is a page builder after all. But it's only one of the things Live Composer will allow you to build on.
With the "post templates" system you can create a template and apply to all the posts. No need to recreate for each one.
Themes generally come with a plain 404 page simply stating it is a 404 page. Now you can build your own just the way you like it.
Yes, another thing you generally have no control over in themes. You can build your own search results page.
Take control over the author archives. Yeah, another one of those pages themes don't generally give you control of.
Want the category pages of each post type to be different, suited to their needs. You got it, build them the way you want them.
On the left is a screenshot of a demonstration website I built only by using Live Composer and the blank theme that comes with it.
Is that website available for others to use? Of course. You get that one for FREE and there will be more free ones like it.