Not just on these particular features but alot of other stuff too. Like the LED side signs on the R142's and R188's for a example. How is it that only one car on a R142 has those signs but the other linked cars don't, and for years now R188 7501-7505/7506-7510 has had those LED signs as well but the other units, nothing. Someone could probably just say "There just testing them out temporarily" but it's been years now with the R188 consist which I mentioned before, having those "experimental" LED signs.
Maybe they can update the side signs on the current NTT's to something similar the R211's have on the side signs with the proper LED color bullet route sign.