I’m not sure I understand the question 🙂
I think that the examples in that video are just meant to be simple to demonstrate how it work and not necessary what can be done with it.
If I was going to build a layout for columns I would more than likely call it something like “columns” and have a radio button for selecting the number of columns to create.
Or I might even have a repeater to allow creating whatever number of columns they wanted and maybe have settings in each column to allow the editor to choose the width of each column.
The only time I would create a layout for a specific number of columns is if the layout needed special features that were not specific to content (wysiwyg fields) in columns.
