Sucrose offers easy AoE debuffing attacks with Viridescent Venerer, crowd control with her Skill/Burst, and a crazy Elemental Mastery buff that still puts her among the best Supports in the game to this day.

Source: https://gamerant.com/genshin-impact-lynette-common-beginner-mistakes-avoid/

While Venti, Kazuha, and Sucrose are popular choices for their supportive abilities, Xiao was long considered the only viable Anemo DPS character.

Source: https://gamerant.com/genshin-impact-best-anemo-dps-xiao-wanderer-heizou-comparison/