Since the decoder is implemented in a PLA-style matrix, you don't save any space by omitting transistors. So that's not a motivation. Random thing: chip transi

Since the decoder is implemented in a PLA-style matrix, you don't save any space by omitting transistors. So that's not a motivation. Random thing: chip transistor counts usually count "transistor sites" rather than physical transistors, so the omitted transistors still show up in the transistor counts.