It is easier, but it's still possible to solve the UX issues with a decentralized service, in my opinion. What I think is the main issue is that these decentralized services are made by programmers with little regard or intuition for UX, and there is also a lack of funding to work on UX problems.
I agree the UX challenge is much more challenging for decentralised services. I don't know enough about Bluesky to really comment on whether it is centralised or not.
Regardless, I think there's another thing that helped Bluesky: VC capital. In particular, to hire people to work on UX. It's a bit of a pet-peeve of mine, but I find it strange that designer don't contribute more to projects like Mastodon, which definitely need it. Even from the selfish angle of building a portfolio, helping solve Mastodon's UX challenges is much more impressive and realistic, than doing the millionth redesign of Gmail that will never get implemented.
People are running every element of the Bluesky / AtProtocol stack independently. Bluesky could disappear and it would continue to function as is (albeit with lots of Bluesky data lost).
PDS's to hold users data, relays/firehoses to aggregate & forward traffic, AppViews to create composite views of likes, replies, etc, resolvers to lookup DIDs, clients to access the network. Each of these has independent implementations. BlueSky is already decentralized & already has viable credible exit. It's not decentralized, and indeed the scalability & accessibility of having firehose consumers has the greatest scale out decentralization characteristics we've seen anywhere short of BitTorrent.
I don't know why you're being downvoted. I tried it the other day and this is indeed how it works. I could even see my home traffic rise and fall over the course of the day in time with activity on the network.
It seems quite reliable that Bluesky gets down voted. Whether it's mastodon/Fediverse folk or right wing pro twitter philes or both, I dunno, but it sucks to have aggressors out there, dark forest freaks sniping away.
I try very hard to find the positive & to upvote things I don't fully agree with, if well argued. I wish the social network of HN could do more against adversarial zero-sim thinking, didn't have people who insist on draining.