I was the author of the original Mos Eisley thread mentioned by the OP. Since the time I wrote it (days after the release of PHB2) I have realized one thing: a huge number of people don't care about playing in a cohesive, believable fantasy setting. That's totally fine. People enjoy D&D for different reasons.
In general, it seems that people who like to play bizarre crystalline gem-people who go adventuring with minotaurs, dragonborn, githzerai, and devas, who spend their off-time hanging out in taverns being served by a tiefling bartender and his staff of shifters and goliaths in a town populated by... whatever, do not care overmuch about campaign cohesion.
That's totally fine. In the same way that people who love terrible movies like Transformers, Armageddon and Twilight are fine. Some people have a lot of fun soaking in the glorious awfulness of bad taste.
People who like that type of D&D likewise view the "humanocentric" type of D&D (that is, 1st, 2nd and early 3rd edition), as "boring" or "same-old-same-old." To each his own.
Still, the core philosophy of D&D 4e is that everyone embrace this new version of mish-mashed sci-fantasy. There is no question that a DM and his group of players can pick through the sillier races of the PHB and play a more "classic" fantasy version of the game, if they desired.
But, why bother really? If you're a vegetarian who wants a bowl of vegetable soup why would you buy a bowl of beef soup with vegetables just so you have to pick out all the meat to throw it away. And even if you manage to pick out all the meat, you can still sort of taste it swilling around in the residue.
I also predict that people who like 4e will disagree with me while people who dislike 4e will agree.
Weird how that works.
