I own two LC+ locos. The Reading GP-7 and the Pennsy A5. Both have Bluetooth. The control I have with my iPhone is impressive. I can adjust the sounds very simply. That said, I have to look at the iPhone in order to control the loco. With the remote, that came with the locos, control is by feel. No need to constantly take my eyes off the train.
I suspect younger operators who grew up with all of the newer technology must be laughing by now. I still text with my pinky. I don't know how some of you can use both thumbs to hit those letters.....LOL