Buttermilk always seems to have like a one week expiration, but always seems to be fine up to maybe 2 months surprisingly

Subnormality

I am not as familiar with cura, but prusa slicer / super slicer have a tool cut any model along a plane into 2 pieces. That seems to be what you want.

I think it depends greatly on your preferred workflow and what you plan to model. Parametric drafting like fusion involves creating dimensioned and constrained sketches and manipulating them. Where direct modeling like blender or plasticity is more like painting in 3D

You wouldn’t create a figurine using parametric tools as all the fine detail would be impossible to constrain. At the same time a precise gear that needs to mesh would be difficult to model in a direct modeling tool as it’s difficult to make the precise teeth