Thanks for your question.
1. Unfortunately, Gravity forms plugin is not tested with our theme. Should be fine but may need some styling improvements.
2. Our theme was developed mainly by using Elementor page builder. So it has some custom elementor elements. Gutenberg only supports standard blocks.
3. No. Yoas is not coming with our theme. But it is really easy to install.
4. Unfortunately, there are no raw files in our theme.
If you have other questions just tell us, we will answer with pleasure.
Have a great day 🙂