That function has been there forever. Brands and influencer are currently scared that an upcoming algorithm chance will make them less popular with their followers.
While this may be the case, popular things tend to rank better if you have looked at any other network. In fact the only people who the timeline change would possibly affect would be those with few likes (likely because their posts are unpopular or annoying).
Turning on notifications would just flood your already flooded phone with more pop ups. That’s something I don’t even do for people I like.