Hello!
Please consider adding a parameter value in article params on which editor the article content was created. This is not something that will break SPPageBuilder. It is just something nice to have readily in params rather than creating an extra line of code to check what editor was used in the article.
The default HU settings for all component views will have a wrapper that has a class "container" right after the main body section. In HU settings, I can set the main body section to fluid and it will remove that wrapper with class "container". It works great! If all of the Joomla Articles is using SPPBuilder, it is awesome! But I migrated a lot of our old articles that were created using Joomla Editor and is also rendered in full width. In my tpl override, I have to do a check in the item->text if it contains "sp-page-builder" so I could insert a wrapper in the layout with class "container" to make those article item not use a full width layout. It would be nice if that information is added in the article item params. I think it will also be useful for other layout styles.
Thank you!
Jackson