The a7 2018 should get the new update for AR emoji that's included in the a70 and a50, as my phone supports AR emoji, it might aswell get updated with the other phones, this happens with other apps on the a7 2018 needing an update such as Bixby vision, and camera. Please I want to be using my Ar emoji while my friends use their animoji/memoji. My phone was made for its camera being the first triple camera samsung, at least keep some camera features updated as many people that bought this phone got it for its camera, now it's like it's not even cared about anymore.
My A7 2018:
I guess that would be good, but Samsung hasn't even given AR emoji to my a8 or any A8 for that matter (same specs as A7, and dual front camera which was HEAVILY marketed- they even have it to j6+ with sd425 a budget CPU from 2016) so I doubt they would do so for the a7. The a series really has poor support to be honest.