You don't know that. We are talking 128. How do you measure those 128 layers? When does layer 64 not sound exactly like layer 79. 82, 67, .........yada, yada, yada,
Basically I'm not gonna fall for a library with zillion of layers thinking it is more realistic. Last I heard people don't listen on high fidelity systems. These are people who are not into DAWs.
I get it when there are few layers like soundfonts but our ears are much different than the listener. These people listen on phones. No one does 3 way speakers and high end receiver.