In comparing Bluesky to Nostr I'm specifically comparing the client/app/FE, as I said.
Bluesky, more proper, is (in AT Protocol terms) a whole platform: client/app, app view, firehoses, relays, PDSs, etc.. —All the moving parts that makes AT Protocol so incoherent and difficult to truly decentralize with self-hosting and independent providers (the only really viable self-hosting right now are PDSs, but +90% of users will never do this; There exist a couple alternative app-views, but nobody fully hosting out a complete AT Protocol platform as Bluesky is).
But, specifically, I'm referring to Bluesky as the client/app/web FE when I discuss it here. Their client experience and onboarding is beautiful and straightforward. Very palatable for new users.