Well this isn't a very good video to showcase the vex though. The bullets have very high tracking at a mid to close range and the zen moment kicking in helps as well at optimal range. Test it against some enemies and in the crucible cause the bullets do have a lot of sticky properties themselves if you have a target.
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At those points travel time kicks in and makes you miss shots. Vex is consistent at close range only nowadays, where things like TLW and Shotguns dominate it.