I spoke to Harley Customer care today about the issue. There is some acknowledgement on their part that this is a feature that is desired by many, but for whatever reason they intended on discontinuing, but yet they are still having discussions about it. They were surprised to learn that my back actually had sidetone when I took it from the dealer. They were also supported that a bike in Bend, Or at wild horse Harley - a 2015 CVO Road Glide has it both before and after the 1.19.1 update.
Anyhow, I urge anyone who is interested on getting this feature put back with some reliability in the next software update to make some noise about it. The best way to do that is to call Harley customer care... They are the voice of the customer.
The number to call is 414-343-4056. The person I talked to is John... Nice guy who knows some of the background on this issue and understands the frustration with it. The more they hear from those who want the feature in the new bikes, the more they will be urged to do something about it..