Do I need the Beaver Builder child theme?
Yes, and here's why.
Unlike some themes where there are various flashy child themes built on top of a framework theme, the Beaver Builder child theme that's available for download on your My Account page is blank.
Because the child themes that you used to invest in aren't necessary with the Beaver Builder Plugin and Theme. Once you install the Beaver Builder Plugin and open a page for editing, you get to choose from a large number of templates to design your content area. And the new Beaver Themer plugin, currently in alpha release, will help you design headers, footers, blog posts, and other parts of the page that are usually controlled by your active theme. Unless you find a theme or child theme where you really don't want to change a thing, just plug in content, it's going to be easier to build exactly what you want with the Beaver Builder system.
So why should you install a blank child theme? So that any code customizations you make don't get overwritten by updated versions of the parent theme.
See this WordPress Codex article for more information about why to use child themes. WordPress has instructions for creating a blank child theme, but we've made it easy by creating one for you to download and install.