What if the products have different sets of functionality? (Which is the case for soundcloud's app). Also, there's more platforms out there - eg embedded players (sonos, etc). It's hard to keep parity. In fact, both apps used to consume their public API before this BFF model came along... And it's now theoretically easier to evolve each individual app. That said, the actual show-stopper in those architectures is the microservice constellation behind it, so I'm yet to see a case where BFFs add anything other than redundancy and more complexity to the mix.