The site says "Layers is built into the WordPress core.." That means any site built with Layers could potentially break horribly when you update Wordpress. Doesn't sound like a good idea to me.
Now I'm confused. Didn't you just say that your tech is built in top of WordPress (below)?
> We haven't touched the actual core of WP but instead made sure to use what WordPress already offers and work to improve the UX around it.
Many existing WP page builders out there look nothing like WordPress at all. Their interfaces are totally different and their code is not to WP's high standards. We wanted to avoid that with Layers. We wanted you to still use WP as is without feeling like you'd just installed something that takes over the normal experience.