Yes, it is technically challenging to incorporate all services into a single app without compromising the user experience, such as social media, marketplace, music service, and more.

There is also a philosophical concern that many people, including myself, are worried about, which is the risk of centralization if we rely solely on one flagship app.

My proposed solution is quite different. I believe that clients should not build all the features themselves. Instead, they should provide users with the ability to add these microservices web app as extensions to their existing client.

So you can have more integrated experience without compromising the decentralization.