I know in the case of DLP, we were working over the design of the WDW MS and it was not really emblematic of a small town as much as a victorian resort community. Different emotional feel. We skewed it into being a hybrid with the billboards and Americana. It has a richness that is addictive and rich, but it never had the warmth of the "Mayberry" feel of the DL version.
DLP's Main Street reminds me most of Disneyland, rather than Magic Kingdom, for some reason. Maybe because DLP's castle is more whimsical, welcoming and "cute" like the Disneyland castle, versus the Magic Kingdom's castle which is more fortress like. As hub trees no longer hide the castle as much, a lot of the vibe of Main Street comes from the castle.
Anyway, it was a bizarre experience to live in a foreign country in Europe and then visit a place I've never been before (DLP) and immediately have my homesickness vanish and feel at home! It felt like being in Anaheim a world away.
Beyond the details of the shops, I think Main Street serves a critical function for park guests, who may well be tired/weary from travel, in that it is relaxing and gets you into a state of mind to enjoy a theme park. Some motion pictures start off with action, like Indiana Jones, whereas many other begin with footage of whatever community in which much of the story will take place.
Somehow starting off with Tomorrowland, like MK's, with a bee hive of activity with the rocket jets and People Mover seems wrong as I would guess that the guest never gets a chance to relax and shift gears.
It will be interesting to see how Shanghai's entrance plaza works, despite not being a Main Street, there will be a decompression zone via the greenery and water features.
Main Street in the castle parks also provides this rich sense of community and pride for the park . . . Chinese society is different, with regards to political freedom and expression, and perhaps the average Chinese guest might not want to feel like a "citizen" but rather to run off on a great adventure far removed from anything even remotely similar to modern civilization. I kinda think that the Chinese government nixed Main Street in part due to it being American, in addition to not wanting to showcase a idealized foreign town which might promote some thoughts about the grass being greener on the other side.
I figured they might go with a nostalgic and idealized Chinese village/street for Main Street . . . but as the current regime in China only came to power relatively recently, they're probably nervous about depicting warm fuzzy nosalgia for a time when their regime wasn't in power.
I got say, China has made improvements, but they still hand over North Korean defectors caught in China to North Korea . . . where they know they'll be executed or sent to a work camp. Chinese also can be heavy handed with their own dissidents. Overall, I think a Shanghai Disneyland could actually help China work through its problems by showcasing, hopefully, a brilliant piece of urban design which has worked well for over half a century, and maybe start them to think about a big, bright and beautiful tomorrow.
North Korea's Kim Jung-Un likes Mickey Mouse, and one of his brothers tried to sneek into Tokyo Disneyland . . . about the only country he can travel to is China! It would be kinda surreal to see Kim Jung-Un in Shanghai Disneyland, I'm sure the Chinese might close the park just so he could visit, perhaps in exchange for scaling down his country's nuclear program. Mickey Mouse as diplomat? It will sure be interesting when the park opens.