There are over 200 shortcodes/blocks/elements in Rogan WordPress Theme. You can use any block/element into any page as you want.
yes, you can use all the Home demos in a single website.
Yes, WooCommerce is integrated and fully functional in SaasLand. You can build your own store using SaasLand.
Yes, SaasLand is compatible with Gutenberg.
Rogan WordPress theme comes with “Elementor” which is a very advanced, drag-n-drop page builder. For Elementor related issues, you may check their support: https://elementor.com/support/