A tangential question. If these galaxies are so much redshifted, then they are probably very, very far. Like more than 1 billion ly far. And if that is so, they should look exactly the same today, tomorrow, in one year, or in a hundred years. If for some reason we wanted these images in much higher resolution, could we just point the camera to the same spot and take millions of shots and then apply a super-resolution algorithm?
I believe that in the image assembly pipelines for processing these astronomical images, they already do take into account / use the "dithering" patterns that you're hinting at. (Often the telescope will be pointed in a pattern with sub-pixel offsets over multiple exposures to do exactly this).
However, 2 factors:
1) there is an intrinsic limit I believe to how much more resolution you can recover (maybe a factor of approx. 2x?), for a lot more exposure time needed However, also at these faint levels of brightness you're also competing against intrinsic photon and sensor noise)
2) practically, given the value of the telescope's time and not much more to be gained (science-wise) from achieving this next order of spatial resolution, they want to spend the time on other new targets instead of sitting on the same patch for much more time.
