It is an update and it is beneficial in three ways :- #1. It saves the bandwidth. #2. It supports the fading opinions. #3. It helps users to have a hassle free experience as it'll hide unwanted gif (as some people use 2-3 gif in one opinion)
This is the first question I've looked at in around a week or two so I don't know what you mean (yet!) but judging by the comments, it may be a hassle for some, a godsend for others. If this update came last year, I would be cheering haha. I barely had any data in my dad-to-day life and all the pics and gifs would use it all up in a few seconds or so when I loaded the page.
Some people, like me, have to pay for bandwidth and this new feature, assuming it is in fact that and not a coding error, saves us quite a bit of data by not automatically loading all the images on a page (like when people post memes in response to some questions) and only shows images (spends data) that you choose to open. But I can unerstand how it could be annoying for people who get free internet.