Brothel in the first episode...all humans.
Security company....all humans.
Andor's friends on home planet....all humans.
ISB meetings...all humans.
Coruscant antique store....all humans.
Val Sepsis's raiding party....all humans.
Imperial outpost and weird hippie mountain people....all humans.
Imperial inter-office politics...all humans.
Prison planet....all humans.
Mon Mothma's dreadful dinner party...all humans.
Marching band at Andor's mom's funeral....all humans.
And other than the ONE droid that rolls around following Andor, and the other droid that arrests him in Miami, I don't recall any droids.
All of these characters and locations are so same-y that it barely feels like they are in the Star Wars universe. More like some kind of super-serious and humorless future society from Doctor Who.
No one is going to dispute the relative lack of aliens and droids, but it definitely didn't give me the sense that the locations felt too same-y or not belonging in the SW universe. I actually think that one of the (many) strengths of the show was the use of contrasting the settings for storytelling effect.
When they cut between the grittiness of places like Ferrix and the opulence of the Coruscant locales, the stark contrast drove home why rebellions are more likely to start in places where freedom is just about the only precious commodity they have, and seeing it get taken away would be so demoralizing. Meanwhile, even well-meaning bureaucrats and other kindhearted well-to-do are going to drag their feet more because of the comfort and luxury they'll have to risk, not only for themselves but for their families.
And another contrast to both of those was the sterility and uniformity of each Imperial facility, including the data management offices. You can see from that how it would be more likely to foster a hivemind where Imperials would end up believing in the cause of maintaining law and order to "protect peace and prosperity."
I thought all of the settings had enough unique flavor, and more importantly, had a *story purpose* behind their design and portrayal. Sticking aliens everywhere wouldn't have made as much sense from a practical perspective, compared to having them in the settings that *did* make sense. Loading scenery with tons of different aliens, no matter the lack of logic behind it, would be the sort of thing you'd get from fan fiction, IMO.
As for the list you composed, there shouldn't be aliens in any Imperial setting if you want it to jibe with the OT. And the prison colony was basically a labor camp, so it's not a stretch that the Empire isn't going to accommodate multiple translators and proper facilities for each species to be able take a dump when prisoners are there to build Death Star parts as efficiently as possible. I understand your point about the other locales, and I concede that's all fair enough, but you're exaggerating a little bit on a few of them being all human:
Sorry for the long rant, but this show is basically all of Star Wars for me right now.
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I couldn't have much higher regard for it.