I'm sorry but having unnecessary markup in a section, then jumping through a bunch of extra hoops to with adding more markup in the form of a class then going through all my css and add negation pseduo class to all the relevant selectors is a "feature" the same way that people joke about about Ford's heated bumper for when you have to push.
Also the to mention of having additional containers for those people who want them is also poorly implemented as containers levels can only be added in groups of three.
Also saying you can't gaurantee how your custom styles will affect global blocks, therefore we just won't apply the custom css is ludicrous because you apply them to the pages. What's good for the goose should be good for the gander.
I realize you probably didn't write any of the code for these functionalities so I'm not trying to beat you up but the reasoning behind these "features" is downright laughable. The global blocks are simply half baked and these are the justifications they gave support.
I hope the global blocks and additional grouping elements in the page builder are reworked because conceptually they provide absolutely incredible functionality.