That it is following the same funding model that resulted in the problems we've seen. Bluesky currently doesn't generate any significant revenue. At some point they will have to in order to satisfy investors. If they were concerned about preventing the problems previous social media sites experienced, they would have sought out a different funding model.
| if you have problems with its decentralization posture
I don't. I was working on federated social networking protocols back in 2008. I'm fully aware of the concerns and I know it's not a panacea. Centralization has strong benefits for user safety and experience.
| there stops being concrete actionable complaints
My other comments expand on the biggest issue which is the advertiser-optimized engagement algorithm. A site which does not cater to advertising (using an alternative source of income such as a user-driven subscription model) can instead maintain a time-based feed. This is a much better user experience. It doesn't favor negative engagement, it's less addicting, and it doesn't create artificial virality.