Take the american biscuit. We can all agree it's bread.
we don't all agree that a biscuit is bread
An American biscuit is a bread product.
If you were ordering food in a restaurant and the waitress asked if you want a biscuit, you wouldn't say "no, I want bread"
You might say "no I want toast" because you're indicating you'd like a different type of bread.
I'd be interested in your reasoning that tortillas and biscuits aren't bread. Just saying "nope they aren't" doesn't go anywhere. You can go into most fast food restaurants, or grocery store and buy already made, or in a store frozen biscuit sandwiches which clearly say "biscuit sandwich" on it.
An English muffin is a piece of bread too.
Go to Tom Hortons website and look at their breakfast menu. They sell breakfast sandwiches on a choice of English muffin, homestyle biscuit bagel or croissant. All are types of bread, as are tortillas, naan and pizza dough.