Counterpoint: facebook are going to add the classic chronological friends and family experience as a second tab “feeds”. In your analogy it would be like mcdonalds splitting down the middle, with the main entrance leading you to tacodonalds and a side door from that hallway leading you to the classic mcdonalds. Parents could send their kids to tacodonalds for a burger taco because that’s what the kids love, while nearby they could enjoy a classic big mac. Most people would probably prefer it that way.

This is just diversification to reach more market segments, and as long as that feeds tab exists they aren’t doing anything different from e.g. youtube, where the home tab is not what I want at all, but the subscriptions tab does exactly what I want.