Lumina as it used to be a 150 has greater handling and more importantly more aim assist than other 140s. This is the same reason dire is still so good despite it looking like its outclassed. Lumina is a selfless exotic but is absolutely devastating when played correctly
Taking palindrome as an example which is widely considered in the top 3 140s:
Palidrome
AA: 79
Handling: 55
Lumina
AA: 88
Handling: 74
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An aim assist difference that can be closed with a weapon mod, perk or armor mod shouldn’t account for what could be a 7 metre range difference on the correct rolled palindrome.