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WordPress 6.0 will attempt to tackle comments lists via the block system. It is an area that has fallen behind other features, which have received the bulk of the work in prior releases.
Last week, JuanMa Garrido called for volunteers to test the new blocks via the Make WordPress Test blog. Contributors are asked to leave feedback in the comments or create new issues via the Gutenberg GitHub repository.
Post comments lists have undergone a few changes over time. Before WordPress 2.7, theme authors used a PHP foreach call to loop over a comment objects array directly in their theme’s comments.php template. It was a simple system of basic HTML and a few template tags scattered throughout. It worked well until the introduction of nested replies. There was a mad scramble from developers and users alike to update themes to use the new wp_list_comments() function.