I’m not sure to undetstand the way of working of the new thank you page. We can only add some additional content to the page but we cannot build up a new custom page, just like we could make a custom 404 error page … etc?
It is actually the same, you can create a custom content for the thank you page with HTML Blocks and WPBakery as well as for the 404 custom error page.
For the second point, you didn’t understand what I mean. If I hide the default content of the thank you page, how can I “call” the functions related to adress, shipping… into my own specific customized thank you page …?