I too feels that the pixilation [into a picture frame] is not the way to go.
even if you double or triple the resolution… for some screens, and at certain zoom it will always be a bunch of blurry square dots… also making them a picture etched into a viewport picture is disappointing direction.
I was very much hoping for a vector based layer for Markup, that will be just a layer in the document .
A couple of days ago i tried to to use it to explain somethings to a client. when i was done, it all turned pixelated and some of it simply disappeared all together.
Sorry and apologizing for the discouraging feedback, but please kindly consider changing direction.