So I did some research and found that the script inside the “Egg of Destiny” item was removed on January 16, 2020, followed by the PointLight a few hours later. You can confirm this with the replies below in the bug report.
I found the related DevForum bug report post, and I think @subcritical, the Roblox staff involved in this incident, should make a statement if a real reason is being searched for (They’re quite active on the DevForum, so I don’t see why not):
Actually, the bug report only needed the script to be removed, but the PointLight was also removed, and despite being questioned by several users, they didn’t get further responses.
However, I still agree with the “we don’t want anyone to have an advantage in certain games” argument, but I hope this doesn’t lead to a snowball effect that could result in removing particle effects as well. I’m against that because particles already show up enough in dark games, and it’s not hard to imagine that we’ll eventually reach a point where we can’t say anything once they’re removed.