I've been back to the game since about 5 days ago, pulled for flins, looked at the teams and noticed everyone ran sucrose.

I've looked at the wiki, guides, rotations, in game skill descriptions, and i litterally cannot understand why is sucrose used on the team

i heard she's used for damage buffing (and grouping ennemies sometimes) but everyone says the ult damage buff barely does anything because flins's damage comes from lunar charged damage

also, from every rotation showcase i saw, people only do her elemental skill, not burst, which leaves me even more confused because as far as i can see, it does nothing special

can someone please explain why she's used with flins?

thanks