A lot of complaints recently that Farcaster doesn't have enough "beef".

I'm happy to fight with you.

Bluesky has more users than Farcaster and is also sufficiently decentralized.

What is the best argument for why devs should build on Farcaster instead of Bluesky?

Answering the question "where's the beef?"

There are as many developers outside of Farcaster that would argue that the Personal Data Server approach is superior. But, I rather than rat-hole on that topic, I am looking for the best arguments to build on Farcaster of Bluesky. Is that best one?

> There are as many developers outside of Farcaster that would argue that the Personal Data Server approach is superior

Users don't care. Developers care about 1) reliable access to users 2) access to global state.

I'm not in the Bluesky ecosystem so don't know what the developer sentiment is. But I suspect you increase developer interest / adoption the more permissionless your system is. For example, Nostr is also permisionless and has a lot of developer activity.