Where are any of the OT/Prequel aliens? Mon calamari (outside of Ackbar), twi'leks, togrutas, bothans, hutts, aqualish, rodians, etc. They all seem to be absent despite much of the Sequel trilogy taking place in or near the Outer Rim. Hell, Canto Bight should have been a Hutt haven with rodian (Greedo's species) mercenaries and twi'lek slaves/servants (since they're basically the #1 slave race in SW).
I'm not against new aliens having their time either, I mean the gungans and nemoideans certainly had their spotlight in the Prequels, but it's just kind of odd that there's no crossover between older aliens and the newer, Disney designs. It doesn't help that a lot of the new Disney aliens kind of have this weird thing going on where they all kind of look like offshoots of the same species with beady eyes and derp faces.