Comment by marcosdumay

Thumbnails, image matching, low-bandwidth summaries... There are plenty of uses for smoothed images. Also, there are many interesting transformations you can use on computer vision and image processing that start with a blur.

If I try to map the first three into text, there are automatic TL.DR. like you said, document grouping, and search into entire document stores (as in do documents in this store deal with this idea?). On "artificial document creation", there is that highly valuable service of answering stuff like "hey, that thing with sticks that rotate and pull a vehicle around, what is its name again?"