Why is Teamwork even a new perk archetype

Teamwork perks don't make sense to me, they don't add any type of mechanic (unlike hex, boon, scourge) and there were already perks that did the same job (blood pact), and on a thematic level there are other perks that also have that same dynamic (prove thyself) and they don't get included as a pass in the category.

So I just don't get it, why is it a new perk archetype ?

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