I suppose that I do analyze games for reason and themes more than I should, but then again I also enjoy creating them. I love more narrative games, but I like having that balance of clear and understandable terminology and reason. It is too easy in a narrative game to have a disagreement on what something means, such as what we are having, if there isn't enough descriptive fluff to justify the mechanics.
You are correct though, this pandora's box only opens if you allow PCs to take attributes below racial averages.
I get why you are analyzing it though - trust me. I think this is why the devs didn't implement a system where one can deduct skills at chargen, really to prevent this debate. It's a lot easier to say, 'this is the average Rodian' with most player comprehending that (especially first timers, which this system is very good at bringing in new table-top gamers). The system almost 'dumbs down', if you will many other dice-rolling table top systems, even other d6 narrative systems like WEG, which EotE is heavily influenced. It's creative streamlining and I know a lot of people like customization and this game really doesn't present a mechanic for doing so... It really streamlines down the character generation process, personally I appreciate that. While we can debate over what clearly defines differences in various characteristics, which is fine, at the same time I can just tell my players 'these stats are baseline states for a species, by adding characteristic points, it demonstrates how your PC is above average' is a lot simpler and less to explain than saying,
/joke 'you can trade your characteristics in, but now your will need to RP this way, and explain why your wookiee is 5'2, doesn't know how to climb, is weaker than an average human, somehow escaped the grasps of the empire on Kashyyyk, isn't easily captured (since wookiees are rare and prized commodities as is), has to wear a breathing mask because his lungs didn't develop properly (so I could get an extra XP like a Gand), knows how to speak basic, has the force and is smarter than Yoda at chargen. /end joke