Id call it portability.  You can move from one app to another *within nostr* quite easily.  But interop with the rest of the web is low.

People are in the habit of building big apps, because that's what employers ask for, that's what pays, and that's what has been taught to a whole generation.  So there's an overhead for most projects, and you can then do alot.

Micro apps are new because people are not used to *composable* micro apps, they have always had to do it all.

If someone builds a profile manager app, the whole of nostr gets a profile manager app.  This is a new mindset for most people.  Im one of the lucky ones who has seen this before with the Solid project, and webid before that, so I have had 15 years of anticipation of this happening.  Glad to see it finally arrive, after some stops and starts.

As an aside, this is the vision tim berners-lee had for the final version of the web, which he always viewed as a work in progress.  Interoperable + portable micro apps.  We might be half way there!