A GIF is worth 1000 words, so please see below.
A number of elipses (plot points) are within a frame (or group). When the container resizes the elipses should:
- retain their relative position (the way they do within a group)
- retain their absolute sizing (the way they do within a frame)
How do you get both, as in this example of a plot, where the red dots should retain their size but still sit on the right point of the graph when the graph resizes?

I had hoped that setting each ellipse to “proportional” and then “top+bottom/left+right” within a frame would do the trick, but no.
And using a group, well their size gets wacky - they either distort into ovals, or, with proportional turned on, they get huge/tiny when adjusting the graph along one of the axes, none of which is desirable.