I am not sure what the purpose of the two images posted is. If the purpose is to demonstrate the benefits of high resolution then IMO they failed. How much resolution do you need for leaves and blurred water?
The purpose, as mentioned, was to demonstrate the usage of stitching for non panoramic aspect ratio images.
My personal view is that landscape containing leaves is, on the contrary, one of the subjects needing the highest possible resolution. Without that they look like a blurry mess to me. It really depends on the level of technical quality you shoot for relative to the media you print on, the sizes you are targeting,... This pretty much ends up being the defining factor for the whole photographic approach. Just like some people think they need 8x10, others a 80mp phase one back, I think there is a need for more and find it fun to try to achieve more. The next sample is another stitch captured in the same location with a 400mm f2.8.
As far as the water fall image, does it only contain blurred water? Do you truly believe that blurred water is what makes this image work (at least work for me)? That's not at all how I vizualized it in front of the scene, that's not at all how I designed the image, selected the point of peak focus,... The whole image is designed around the contrast between the extreme resolution of the sharp areas as opposed to the blurred water. The water serves the sharpness.
Cheers,
Bernard