Imo all apps like facebook, twitter, Instagram, reddit, imdb, or anything else that requires network and gives almost no benefits are pointless (and always were).
I see most people are finally getting it and there are less useless rest clients nowadays.
There few use cases for such apps - if you are bad at webdesign and have lots of free time. And second thing - theoretically app requires less bandwidth for requesting only JSON.
I think the reason you can make that statement is because the mobile web got better faster than app SDKs got better. That’s a good thing!
A few things apps can do that I sometimes appreciate:
If mobile web could do all of those things we’d be set.