French bread is just normal bread, while most other places seem to use the Chorleywood process now, which produces something different.
You can find bread as good as French bread in other places, like some Belgian bakeries but definitely not all of them, or in Vietnam and much of North Africa.
It's really just that much of the Western world seems to have moved to the Chorleywood process because it's cheaper while France has laws to prevent it.
You can get soft bread in Norway that is much like the stuff that is ubiquitous in the UK but it is marketed for making toast. Most of the rest is much more interesting, and I'm sure better for you.
You can buy non-chorleywood bread from bakers and from most supermarkets in the UK (look for their 'sourdough' loaves, some might even give a fermentation time)
But French bread is still particularly good somehow, there is just nothing like a fresh baguette from a baker in a small village in rural France.
So there's something else going on there IMHO. Specifically with baguettes.
(I wish I could find a good baguette here in Western Australia, most of them are utter trash. As are most of the croissants, though I was able to find a specialist baker for those so not all is lost...)
I don't think that's the only reason. Here in Germany, you can also buy that fluffy white bread—usually wrapped in plastic—that's probably made that way. But most bread in Germany is still produced the traditional way, especially since it's often not pure wheat bread but rather rye bread or mixed-grain bread. Still, a real French baguette is unbeatable. Maybe it's the quality of the flour. But I'm sure it's mainly the very long resting time before baking. In my experience, that's also what makes pizza dough especially soft and flavorful.