I'm confused. First, I don't have a clear understanding of what jig-lag even is, which is a problem if you're trying to address a developer with a term you made up. Second, the posts you pasted here conflict with eachother; one claims there is some sort of issue with latency to the server in fishing, while the other post claims the "problem" is a coded anti-bot mechanism.

If I am decyphering properly, then the term "jig-lag" is referring to "the loss of fish due to exceeding the ~10 second jig time limit". You'd have to have like 3000-5000 ms of latency for this to be a problem, in which case the entire rest of the game is likely also unplayably laggy. I suppose the issue could be fixed if the client is sent the fish's position before each jig, so the game occurs locally on your machine. But then someone smart will probably be able to isolate, read, and interpret that data and develop a way to have a 100% catch rate...

How bad is the problem? I lose like 1 in 10 fish or so on the first jig, it doesn't bother me and I chalk it up to jigging the Wrong Way(tm) with a big fish on the hook (also seems to happen a lot if I jig at the absolute extreme end of the jig spectrum).