Is Surf the future RSS Reader to rule them all?

Encounter5729:

I actually meant FeedFlow

This looks pretty neat. Do most RSS readers load articles in an external browser? Because I would rather read my articles inside the app. I also see that they support backups via Dropbox. If that is the case, why not support all popular cloud services like Proton Drive. It would be cool if they supported Filen too, but I can settle for Proton Drive.