Comment by hackinthebochs

Neurons having narrow semantics means you can inspect what a neural network is "thinking" with confidence and even constrain its space of behaviors by activating/suppressing a small set of neurons that have very straightforward effects on its behavior. This is in contrast to polysemanticity where reading the state of any number of neurons may not give insight into what state the neural network is in and controlling the network by activating/suppressing neurons is nearly impossible to do reliably.