I mean, it’s the same reason you can’t find a great mission burrito in Paris. Every city has its own food culture.
I don’t know if GP was suggesting it, but it absolutely unironically is. At least from the perspective of anyone who thinks of bread as a standalone element; bread as a neutral canvas for other elements is fairly central to, at least, many of the distinct American food cultures.
“Better” is subjective and shaped by experience and cultutal expectations, among other factors; for a set of food preferences that are fairly common in the USA, no, it won’t, which is why it is hard to find “good” bread (which is not particularly more expensive to make) on the market in the USA, and why what little their is commands a high price; people to whom it makes a positive difference are rare, and disproportiinately price insensitive.