Districts should reflect the constituents that live in them.
Marginalizing groups by splitting and packing is an affront to a representative democracy. This has become pathological now that there is software that can nudge boundaries by a single neighborhood block to chose the desired voter distribution.
That's tautological - by definition, every district reflects the constituents that live in them, no matter how it is drawn.
But I think I know what you mean. But I also think that even if you don't split apart certain neighborhoods or regions that have very clear boundaries (which isn't universal), it's still very easy to go pretty far in the 5/4 direction or the 9/0 direction. So this standard doesn't really answer the question.
Marginalizing groups by splitting and packing is an affront to a representative democracy. This has become pathological now that there is software that can nudge boundaries by a single neighborhood block to chose the desired voter distribution.