None of that is what we are talking about. The question is, why is there a small L1, medium L2 and a large L3? Why not just have it all be L1? And cost plays n

None of that is what we are talking about. The question is, why is there a small L1, medium L2 and a large L3? Why not just have it all be L1? And cost plays no role in those decisions. Making the L1 or L2 larger would make them too slow. Only the size of L3 is limited by cost.