Why don't the 4 string models have the pickup switch?

Hey all! New stingray owner here. I have a 5HH but have also been interested in getting a 4H as well, but I’ve noticed that none of the 4H models come with the pickup switch, but all of the 5H models do. Why is the switch only offered on the 5H models, as opposed to the 4H? It seems like a weird inconsistency in the lineup.