Image stacking for larger prints

[chex]

Ive been trying this image stacking technique linked below but my results seem worse than simply increasing image size or using super resolution.

Am I doing something wrong or is software better than this diy 'pixel shift'

https://www.dpreview.com/articles/0727694641/here-s-how-to-pixel-shift-with-any-camera

[MichaelEzra]

If you just take three slightly overlapping photos for panoramic stitching, you can at least double the resolution capture and it just works.
I too was once curious about pixel-shifting, but find it unnecessary given the simplicity and much higher efficiency of panoramic stitching.