Yeah, I really have to agree with this. Working with designers and PMs in my day job makes it clear that there's an experience put together on Instagram and it's not some Flickr alternative. Things are made to be fixed res and laid out as so by design.
An experience designed by designers that was then put through the wringer so that it accomplished marketing and business needs initially not present. Rarely do designs not change as they move through the development/deployment pipeline.
Then designs are iterated in search of better or higher X, for whatever X business is optimizing for at that time.
