CE - Fully Constrained Primitives are not Parametric?

So i can model and fully constrain 3D slabs and other primitives, but if i need to array those primitives the tools don't work because they aren't parametric solids.... but they are fully constrained in every dimension with variables which means they are parametric?

If i cut the primitive i can make it work but it adds an un-necessary operation is there another solution?

I could extrude a fully constrained 2D profile to make a slab but this is again more complicated then it needs to be...

Am i missing something?

-Grant