My answers to the questions from May 4, 2025:

1. As I understand it, with a Business plan on wordpress.com you can install any third-party theme. 
2. Looking at the WordLand timeline, every post has a headline of author name and date, whether there is a title or not. That looks more balanced that simply having no headline for titleless posts.
3. I think that whether WordLand can add CSS to a site or a post depends on the WordPress.com REST API. At first glance I don't see anything about styles. On a self-hosted site it would be possible to extend the API to accept CSS (ChatGPT), but would WordLand to access that over wordpress.com?
4. OK
5. OK, we can try that
6. OK

Other problems I've noticed

1. Block quotes are not styled properly (they are indented, but no line to the left).
2. On the home page for untitled posts, there is no link to the story page for the post.
3. Bold italics were not working, but do now (fonts issue).
4. Inline code markup like this  isn't very distinguishable from normal text (issue on GitHub).