I was told by Premium Aquatics that they no longer offer the Jr without the display. They didn't have a reason why at the time, but that it was Neptune, and not PA or any other vendor causing this.
IMHO, I believe Neptune is changing direction, at least slightly, in the way they sell the Apex. Force people to buy the display, whether they will use it or not, and see what happens to sales. (All speculation, of course..)
I went ahead and bought a model with the display recently, and I find that since I have the display, I use it quite often. I don't always have my phone on me when I go into the fish room to feed the fish or do water changes (feed mode). And it's nice to get a quick glance at the temp and pH while peeping at the fish tank. Sorry, this adds nothing to your question, but is something to consider.