I definitely agree that real life relationships and communities are the best way to go, but also that our increasingly isolated lives makes that difficult, and some people get anxiety around social situations or just find themselves stuck in a rut of work followed by unwinding at home alone.

People increasingly also don't like being dependent on others, so while your take is a valid one, people who don't think it's true would need an alternate solution to that problem.

There are also some people who would like a better social life but are unsure how to, or don't have the skills or opportunity to do so.

The success criteria of such an app could even be that users should only be using it for a certain amount of time, after which the app should have encouraged and helped the users in replacing app interactions with real life social interactions.