As a Drupal developer, I'll just mention one of the benefits of layout builder is you can toggle it on or off for each content type (as well as selectively override layouts for individual content items).

If it's turned off, content is displayed using the old system (Drupal content types consist of fields, and you get a 'Display' admin page with a table where you can manage the order of the field and how it's labelled/formatted, and drag them around).

It's usable at the moment but naturally still has bugs.