Everything in moderation

The average person wants to be eating around 2,000-2,500 calories in a day unless you're trying to put weight on or cut weight

Carbs shouldn't make up more than about 50-60% of that

If you're eating half a loaf of bread a day, you're gonna have a bad time even if it's good quality bread

Even without sugar, bread and pasta are usually from white flour, that is quite processed and should not be eaten too often. You can replace by rice and other cereals or whole grain, they are all better options

It is a little bit of a fad because you're probably getting enough protein. People should be treating fiber the way protein is treated. 90% of western diets do not have enough fiber.