What

It would be useful and quite convenient if one is able to add a 'categories block'as a sub-menu item in the 'navigation block'.

The closest I could come to this functionality, was by creating a categories list next to the 'parent menu' item and set the categories list as dropdown, but this is less than ideal.

Even then, aligning this in the layout was tricky.

Why

If anyone wants to use the Site Editor to create a category-driven menu, there are no options for this, unless they use a classic or universal theme, where they can create the menu using either the Menu settings in the dashboard or the menu settings in the Customizer.

How

No response