Multiple GP layers in one build modifier and all modifiers influences

is gonna be really good to have multiple GP layers (with considering the order from top to below "like layering them but necesseraly like in layers panel ") in one build modifier instead to dupplicate build modifier many times and adjust for each of them the same values for every tweek which is laborious ... olso for for other modifiers using cases
And also that go well for other modifiers by supporting multiple vertex groups in one modifier """that will make us avoid creating new vertex group every time when we need a bunch of vertex groups get affected by the same modifier with the same values and because of that now actually every time we need modifier be applyed on many existed vertex goup will be hard unless creating new vertex group that contains them or duplicate the modifier for each vertex group and adjust them manually many times for only one tweek """

   so the solution is the  possibility to apply  a single modifier on a list of existed  vertex  groups (by ORDER RESPECT or not depending on the effect and possibility  )   

the same idea for materials .... for every modifier. that will make the life creation easier .... hoping to get this to blender ..... voting please community