A recent changelog includes "Better responsive sizing for Dynamic and Block groups."
What kind of responsiveness? Is it just that a 2 × 2 block will now reflow to 1 × 4 in narrow columns?
In my tests, I found that I prefer a 4 × 1 grid. This makes a 2 × 2 grid where space allows, or stretches all the ads across a widget when the widget gets wide.
So I'd just like to see more details about how it's now responsive.