While Ситлали mainly provides sustain through her shield, her passive Mamaloaco's Frigid Rain, which provides Гидро and Пиро RES reduction, and the ability to fully utilize give her access to great offensive utility for the team.
At high refinements, can be a better option than if the team has multiple attack scaling units with significant damage share. In hypercarry style teams, tends to be better. The other weapons can be a great option if the team damage doesn't scale off of ATK.