Indeed. I am more even more confused now...
All I can say is that my health improved almost instantly after dropping white bread from my diet. I have since then reintroduced it in a very minimalistic way (i.e. less than 60g wholegrain a day, and not every day), but the overall point is that you do not need as much carbohydrates as it has been embedded in the current western societies.
Just eating bread for breakfast and for your last meal at the day in a non-moderated way can get you over ~140-200g of almost entirely useless non-complex carbohydrates. What are you going to do with that? And that is assuming you do not eat any other source for carbs that day! Not counting snacks, cookies, chips, fast food, whatever.
Dietary threads are messy because we have different metabolisms, different resistances to certain types of food, and most importantly: different lifestyles!
From an anecdotal and personal point of view, I have seen people get away with more bad stuff if they work out beside it, but that does not mean that problems cant come long-term. The neglect of fats, the essential amino acids, the long-term lack of key vitamins and most importantly, the overprocessed, FIBERLESS lifestyle can fuck you up heavily once just one cog slips in your machine.
And really, one cog failing is all it takes. One day, your immune system is weakened enough, and bam, your digestive system might no longer accept milk. Or gluten. Or something else. Or one day, you find yourself constipated. (Lack of fibers, yaay). Or one day, you realize that your heart is pounding like crazy, and all you did was eat like there is no tomorrow!
These issues needs to be adressed before they happen, or as soon as they happen, and for that, everyone should eat much more fibers that they do on average, much less salt that they do now, and should have a much more balanced protein-fat-carbs ratio than they do now.
And if we look at this puzzle closely, bread does not really have a large place in it.