Hi guys.
I think you move in the wrong direction. The new option "Fill Columns" may be useful in some particular cases.
But tell me how can I create such a layout in one section so that all columns are the same in five rows?

I suffered half an hour picking up the width of the columns with the mouse and received only it.

Why did you get rid of the custom generator? This is a huge step back.

I'm not sure whether the update will break the layouts made in SP PB 3, on existing sites. Since there is a limit in 8 columns inside one section.
Some addons lost border-radius.

Draging of the addon caused the disappearance of the entire control interface.

Oh, in vain you abandoned the backend interface. Very sad, but I'm afraid you will lose many customers because of this. Since the frontend interface cannot be reliable in case of conflict with third-party extensions.