The Tabs block is brilliant! Currently - outside of your plugin - the only way to implement this is to use HTML markup (as is done in Foundation by Zurb). Do you think there ever be a point that WordPress may implement the "tab" block as a normal Gutenberg block?
Also, It seems that the "edit default blocks config" settings do not work - or at least are not working with my theme. I have not dived deep into the css, yet, but it may be something on my end. I have included a screenshot of the tab settings, and a screenshot of the resulting tabs.