I think the original social networks including facebook and instagram showed posts in historical order. Only later to increase engagement they moved first from historical to some algorithmic way to show posts from people you follow, and then later included the posts from people you do not follow. And then tiktok pushed this to the maximum and started showing you addictive stuff without you ever needing to follow anyone. So the idea is to go to the original version.
The difference to the group chat is that you see posts from different people you follow. Every user has his own unique set of posts based on people he follows.