D Sync has helped me……
It’s made me understand that despite having low ping I can melee someone and they go straight through me turn and kill me.
It made me realise not everyone is a cheater
Yesterday D sync made me laugh.
Fired a rocket at a player, he walked through it (no lag) he then killed me with shots and a nade.
As I died it showed up that I had in fact killed him with the 1 rocket I had 5seconds earlier lol
When and why did lag/latency become desync? I’ve never seen this term outside of Halo Infinite, is it different?
I think a lot of people use the term somewhat interchangeably.
Rubber banding, melee phasing, being shot around corners etc.
A lot of it is obvioulsy server lag. The server and the user get out of sync. So it can also be called desync.
But the things that happen when there is no lag - like during LAN events - are often specifically referred to as desync. Something is happening in the game code that doesn’t sync up the players to each other and what the weapons are doing.
I think it’s mostly when people find shots not registering - specifically hammer swings and rocket splashes.
This is actually stupid.
Think of how many games are online on PC without these problems. Hell, Apex Legends and Fortnite have crossplay that includes playstation and the friggin’ switch, and you’re going to blame desync on hardware diversity?
That actually helps clarify it quite a lot thanks, especially with regards to LAN. The term has just caught me offguard as most of the issues I face are the same lag issues I had with some games years ago, and that I see others having now, and wondered if there was a difference. Appreciated 
Well, they relied on so much contractor work they might not have even done the net code.