98% of all Social media users are on mobile devices, thus the experience there is what matters, not on desktops.

It looks like bootstrap does support swipe for carousel, https://getbootstrap.com/docs/4.2/components/carousel/ .

It is matter of rather than clicking on a button you SWIPE on your phone to get a new photo-this is quite basic in many applications today already, and would be great if SE could add this function to their photos/Albums.