It's less about the World Showcase and more about Disney as a whole.
The resorts, parks, and World of Disney all sell basically the same merchandise everywhere now. There are a few shops scattered here and there with separate merchandise, but generally speaking you could make one visit to World of Disney and then skip 95% of the other shops throughout the property because they're all selling the same items. It wasn't always like that; you used to find wildly different things from park to park, and even from one area of a single park to another. They've homogenized their merchandise offerings.
The World Showcase pavilions have a few specialty shops, but they sell a lot of generic merchandise that's just slapped with the name of the country.