Honestly, if this isn't fixed in the first major patch... it's GOING to be addressed in a hotfix soon after.

The reason I say this is because PvP is 'supposed' to be coming out in 2.1. People will RAGE if these sort of issues happen in a 'competitive' arena. Titan (hard) is easy enough to do if you preemptively move and know what's coming. So are the other primals. PvP is different because there is a random element to it -- and people PvP to win. As it is now, you need to wait for the server to register and update your location before an attack goes off. Your position is updated every 300ms. If a melee, for example, is chasing down a mage to attack... all the mage has to do is keep running and the melee will get the 'too far away' message every time EVEN if it looks like the mage is 'close enough' on their screen. Similarly, abilities like "Fluid Aura" (whm knockback) are going to be hard to pull off because they are short-range.