What problem does this address?

At the moment we show a list of the latest comments for the Comments Query Loop block when there is no post selected during editing the site. However, for all other theme blocks, we show placeholders in the same view:

I found out that the current approach aligns with how the Query Loop block works, for example when editing in the archive template:

Aside: Please note that the numbers used in the Pagination block don't match with the list of posts rendered (there is a single post only).

My biggest concern here is that when there is a ton of comments that include threads the Comments Query Loop block might dominate the template editing view. It also creates this disjointed experience where the data used doesn't necessarily is going to be present on the frontend in the same form.

What is your proposed solution?

Let's consider using block placeholders for nested blocks used inside the Comments Query Loop.