2 points
the problem is its easier to use because there is virtually no federation. Ive yet to see a user thats not from the flagship bsky.social instance
1 point
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Maybe you’re already aware, but bluesky doesn’t operate with instances like in ActivityPub land.
I’ve seen many people I believe are using their own PDS, but yes, discoverability is likely better because a relay is meant to aggregate and share all data it can (look up “bluesky firehose”).
P.S. Mastodon’s devs are part of a new initiative to improve this area of the Fediverse. Because it’s so recent, we’ll have to wait to see how it goes.