You're wrong about the cup measurements, obv, and if you had read the thread (or had ever seen an American recipe published for an American audience) you'd understand why. There is a time honored way to scoop flour, and recipes always ask for certain ingredients to be packed (usually brown sugar) or 'heaped'. You do not pack flour.
My excellent American-published cookbooks, including books specifically devoted to baking, all use cups.
Examples -
Mastering the Art of French Cooking, vols I and II, by Julia Child
Beard on Bread, by James Beard
How to Bake, by Nick Malgieri
Perfect Cakes, by Nick Malgieri
Le Chocolat, by Martyne Jolly
Great Chocolate Desserts, by Maida Heatter
Patisserie of Italy, by Jenni Wright
Patisserie of Vienna, by Josephine Bacon
The Settlement Cookbook
The New York Times Cookbook, by Craig Claiborn
Around my French Table, by Dorie Greesspan
All my Nigella Lawson books use cups and spoons too, as does my copy of The Joy of Baking.
Many of the authors of these books are leaders in their field and seem to have given their imprimatur to volume measurements.
The reason why is that they work. Or do you really believe that American bakers turn out flop after flop using their cups and spoons and never turn to some other way to do it?
Your comment on 'the more sophisticated American bakers' is Anglocentric snobbery.