I hate to be that guy, but celld does essentially the same thing, no? It waits until persisted to another node OR stored in S3, but unless something has gone horribly wrong, this will essentially always be replicating to the other node first. (Admittedly, I recall it used to be just replicating to 1 node was considered stored, and if that went down it could be lost. I think it's two now, or at least the bug is filed. Prob how the write time was so low in celld, but perhaps wasn't sustainable)

Regardless, glad for more stateful serverless options, even if I am partial to what CloudFlare folks build :)