Eventual consistency with zero lag is not strong consistency. Two simultaneous conflicting writes with eventual consistency will appear successful. Strong consistency guarantees that one of the writes will fail.
EDIT: I think the reason people care about the lag is specifically for this case; if you want to know if your eventually consistent write actually succeeded then you need to know how long to wait to check.
Well, in all the threads, they’re describing situations with lag. That is, they’re equating eventual consistently with the lag, and implying it’s therefore bad, when eventual consistency can include unnoticeably small lag.
And thus it’s the lag that they’re actually bothered by, not the EC per se. Hence my clawed out hair.
