There are a few flaws with that in reality. One is too much risk consolidation. Having every artery in the same place means that it’s a very easy target for animals or other humans. Another is that it requires far more complexity to actually distribute resources isometricly relative to their need. It’s also easier for disease to grow tumors in a giant mass of blood vessels since they are very homogenous. Another downside is that heat is not distributed evenly so it greatly increases the amount of energy that has to be spent on building auxiliary blood vessels which means the animal has to eat more to achieve the same reproductive success.

Life in reality is balancing many things. Thermal efficiency is a big one, material efficiency is another. Defensibility is a big one, and also genetic simplicity is another. Your body is procedurally generated, not created from a blueprint really. Cells create structure via functional logic in large part, although there are box genes which encode some basic directionality and relative spatial cell differentiation based on its neighbors and the proteins they are presenting on their membranes.