I see that now the default action when creating a new Header is choosing a layout, which creates a Section and a Row with Columns. It is not even possible to start with a Bar anymore.
While I love the fact that we have the power of Rows and Columns in the Header, I am a bit concerned about new users that may completely miss the fact that there are goodies such as Sticky and Scrolling, which can be found only on Bars.
On the other hand, if they know about the Bar and want the best of both worlds, ie, placing a Row into the Bar to get the sticky option but also to get responsiveness of Rows, they get inconsistent experience.
On the following screenshot, we can see a bar that has a Row element added, and a Section/Row combo below. A new user may have trouble understanding that the Row needs to be set to 100% wide with max-width, etc.
I don’t have any recommendation here. Just some observations. Not sure if they is useful.