In reply to Milos.

Hi, Milos. Thanks for commenting and leaving valuable feedback. You are right that these issues are mostly unrelated to the theme itself. Most sound like they are more specific to full-site editing features in WordPress.

Before diving into the specifics, I also highly recommend checking out Learn WordPress. This workshop on the page vs. site editor may be helpful.

First, if I select “FrontPage Template”, whatever I enter on the page is not displayed.

This is how page templates have worked with both classic and block themes. It is actually one of the longstanding problems I have had with the page template system---there's no way to communicate to the user whether the template supports displaying the page content.

However, I think there's an opportunity with blocks, which are built on a standardized system, for WordPress to show a message to the user if the Post Content block is not used in the template. I'll look into drafting a ticket to see how this might be improved in WordPress.

Then I figured out that I should click the small “Edit” link to edit the template itself.

Yes, this multi-step process is what I briefly described in the post as problematic. I would have rather seen the theme use WordPress's built-in front-page.html template support instead. That way, there would be only one place to make edits.

Second, when I try to add a pattern, many patterns that are not part of this theme as displayed as “Featured”. The use of some of them leads to various problems (white text on white background, etc.). Don’t you think, by default, there should be the theme’s patterns displayed first?

The "Featured" category comes from WordPress itself rather than the theme. It's possible for themes to manipulate this and only show their own. The theme does have a "Catch FSE" category that lists all of its patterns.

I do think this is an important point about the default user experience. In my mind, I want that first featured category to show theme-specific patterns rather than those from WordPress.org.

Last but not least, when I create a regular page (with a Default template), I found it difficult to remove the big header (with page name). Again, I released I have to edit the template.

You should be able to edit the page template from Appearance > Site Editor too. I personally find this easier to work from than the template editor while editing a post.

Maybe there should be a template similar to Default but without a big header.

That sounds like a reasonable feature request from the theme author. I'll ping their team to let them know.