> why someone did not solve the problem already?

Most Americans are fine eating stale or preserved bread. (Almost all pre-sliced supermarket bread is the latter.) You just don’t have enough people to spread the cost of baking fresh bread throughout the day outside wealthy communities.

That said, a lot of European bread is also trash. There are simply some bread-loving ones where it isn’t. Similarly, there are places in America with great bread (New Orleans, New York and Miami), and places without (Northern California and the Midwest).

> That said, a lot of European bread is also trash.

Yes thank you for pointing this out. I've noticed even the bakeries around me (in Switzerland) aren't that great; for me the best are from the farmers markets and even still you have to be discerning for which are actually good. On the other side I've had some fantastic bread in the US from specialty bakeries.