Scale and "connected communities" aren't necessarily at odds. You need a certain scale to have a functioning "social network" of any meaningful utility.
Any interest category outside of Bitcoin or Nostr development itself basically has 0 discussion taking place on Nostr. You simply don't get that with 15k DAUs.
This is why I've been really trying to encourage the improvement of Mastodon bridges. Mastodon has ~500k DAUs.
This still supports all the good stuff about small, connected communities... Because nobody's going to force some "trending" algorithm on either Nostr or Fediverse users.
All it means is that you can actually "find your people" much better because you can select for the 0.01% of the population that actually shares your interests / worldview / tastes.