Please don't shout. I would hate for you to burst a blood vessel. That's very messy and then we couldn't write any more books together. ;-)
Before you state what has 'always' been my opinion or what you think I have always believed, perhaps you ought to look it up first? On page 131 of Artillery (and I usually do not like either to refer to one of my books or quote them) it reads in the fourth paragraph 'New guns of the Systeme AN XI, of which the 6-pounder, a new 12-pounder, and a 5.5-inch howitzer were being produced, and now were issued as soon as they were manufactured.'
On page 132 it reads 'The addition of the new 6-pounder into the French artillery simplified manyu issues, such as the ammunition resupply and the number of calibers used by the field armies. However, the Systeme AN XI was never fully implemented, only the 6-pounde3r and 5.5-inch howitzer being issued in large numbers.' If you don't agree, that's fine, but please don't say something about me personally that isn't accurate. I wouldn't do that to you.
Lastly, it should be noted that Artillery is a volume about field artillery, which was composed of foot, horse, and mountain artillery. Siege, fortress, and naval artillery are not covered in the volume and it states that on page 23: 'It is, though, a study of field artillery...Siege guns, mortars, and guns used to defend fortresses and sea coasts will not be included in detail, except where it is necessary to enhance the story of field artillery.'
As to Gribeauval himself, there has been so much misinformation on him 'provided' on forums and in recent books that the major contributions he developed for artillery in general and field artillery in particular are generally overlooked or misstated. For example, he was not an engineer, nor a 'siege engineer' (whatever that is); he was a school-trained artilleryman and was employed as such in two wars. He is also one of the first artillerymen to develop and implement a coherent artillery system. The only things he really didn't address were a militarized artillery train and horse artillery. And it should be mentioned and remembered that an artillery system was more than merely guns and vehicles. It was ancillary equipment, education, tactics, organization, training and doctrine and some of Gribeauval's most important reforms were in those categories, not merely the development of new guns and vehicles. Many tend to forget that salient fact.
I do have a second volume planned to cover siege, garrison (fortress), and naval artillery. Hopefully that will be done in the next couple of years after other projects are finished.