One thing I've found about the pixel shift images, they need (and take well) aggressive sharpening. Here's your 35 GM crop run through Topaz Sharpen AI. Still not as good as your pano, but maybe better than the original.
And definitely not saying it works well in all situations, as you obviously show. But if you look at the rotunda shot above, it was incredibly painful getting that lined up reasonably well. I broke out my old Gitzo GT-2540EX with the offset center post. Splayed the legs and put the center column at a 90 degree angle. The camera was almost on the floor. It would have been very hard to adjust that to take a pano. The waterfall might be challenging as well, I don't know how well everything will like up in terms of the water flow if shooting a pano.
So different tools for different situations. Options aren't a bad thing though.
