I think it is important to note that the USP is not 'decentralization' as such, it is censorship-resistance/decentralization AND network-effect/interoperability.
Because that is the problem it fixes; the internet was already permissionless and decentralized, and as a result a rumble and odyssee etc exist next to youtube.
But due to the nature of platforms/silos and network-effect dynamics, those 'alternatives' are inherrently marginal.
In the current context of these large platforms, freedom of association always means self-marginalization; Nostr's USP is that that is no longer the case (insofar Nostr itself is not marginal). And this applies to the 'platforms'/relays you use AND the apps/clients you use.
As such we have a story for all sides, be that content creators, app developers, lurkers, merchants etc.
I am on a bit of a Nostr-propaganda-podcast-tour and i notice that all of this does resonate. I subsequently do agree with all the rest of your statement. I am not anxious regarding Nostr's 'growth', because for those that stick around this is conciously a 'final destination', and it ultimately makes sense for most people anyway.