group-level styling and masking

As a Figma user attempting to move to XD, the missing feature for me is the ease of creating storyboards of my designs, especially when designing animated web banners.

I don't understand why XD wants me to create a rectangle, then size it, then color it in order for my group to have a background. Then create a second rectangle so that the group can have a border over all elements in the group.

I was creating an artboard for each storyboard frame so that I could have content stay within the frame. But then XD doesn't group artboards or allow them to be stacked.

Researching shows I can mask with shapes, but then I have to mask each element in my storyboard frame?!

Feature Request: add group-level styling (color/image fill, borders, shadows, padding!) and masking (content overflow: hidden), please!