Why the netcode issue exists, and why it cannot be fixed.

[KraggyKor]

Close proximity (or low amount of hops) to the data servers. In low-latency scenarios, the server live-state model is superior in all regards to client live-state.

So JPs are suffering this problem in large numbers as well because ... ?

Really confused why they decided server side was a better choice..

Because SE's design decisions were based on their paranoia about 'hacking' and RMT, technical issues were entirely secondary. Which is why V1 was a dog performance/UI wise (hacking/botting) and no mailboxes (RMT) and why V2 still has fundamentally broken mechanics like this.