Pretty sure they're not removing stat-changing set bonuses, they're only making new ones that are more balanced.
Nope, they are removing gameplay affecting things from the sets and putting them onto weapons.
'For all of these reasons, as part of this next update, we've decided to change the way item set bonuses work. Players have traded for, purchased, and crafted these items, many in order to complete the sets and get these bonuses, and we're not abandoning the bonuses outright.
Instead, we've moved the gameplay bonuses to specific items within the sets, and introduced new bonuses to these sets that won't affect gameplay balance.'
Basically they're taking the set bonuses and putting them onto some of the weapons within the set, and then changing it so the sets just give bonuses like special voice lines and visual effects.
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