Creating a site right from scratch can be a pain. You need to come up with an idea, a design, content, images, and a lot more. This takes a long long time. However, with the Starter Templates plugin, you can save a lot of time by importing readymade sites that can be tweaked a little and made into your own.
the astra starter site plugin i believe only works with their theme.
you can use Elementor or any page builder on a GP built site, but you will have to carefully optimize the content you build with it as GP has no impact on its performance
More than 300,000 websites use Astra theme and that number is increasing by 1k per day. Plus, it supports popular page builder plugins such as Beaver Builder, Divi, and Elementor. Meaning you can easily customize your site the way that you want to.
TranslatePress is a free WordPress translation plugin that offers out-of-the-box compatibility with the Astra theme, as well as the other tools that the Astra theme uses in its pre-built starter sites such as page builders (e.g. Elementor, Beaver Builder, Brizy), the WordPress block editor (Gutenberg), WooCommerce, and form plugins (e.g. WPForms).
As a bonus, when you install a starter site (via the Starter Templates plugin), you get access to the complete Pixabay image library from within your Media Library, saving you time finding stock images.