On desktop, I often want to swipe the pictures with my mouse directly from the post , and not from the image viewer, Instead of opening the gallery, then swipe.
I don’t feel I always need to see the full resolution pictures, and sometimes the pictures shown don’t even have high resolutions versions. This example was from the official announcement btw.
I can do this already, even on your post. I swiped through the pictures with no lightbox appearing. The arrow buttons and thumbs can be interacted with without it being shown in the lightbox. What device are you using?