Use of getSpecialTableColumnsAttrDefinition Method While creating Table Views from Table Builders?

[TDT]

The PTC Help Center recommends overriding the getSpecialTableColumnsAttrDefinition() method to include new attributes.
However, when I click "Customize" in the table view, all attributes for the selected object type already appear under "Set Column Display."

Is there a specific reason or scenario where overriding getSpecialTableColumnsAttrDefinition() is needed?

[TDT]

The getSpecialTableColumnsAttrDefinition method is used to define a custom table column that is not stored in or related to any object, and to display its value using a data utility

The getSpecialTableColumnsAttrDefinition is used along with getOOTBTableViews

@Override

public List<?> getSpecialTableColumnsAttrDefinition(Locale locale) {

ArrayList localArrayList = new ArrayList();

localArrayList.add(AttributeHelper.newStringAttribute("customAttribute",

WTMessage.getLocalizedMessage(TestResource.class.getName(), "CUSTOM_ATTRIBUTE", null, locale)));

return localArrayList;

}

The customAttribute is used as the selector value to register the data utility.