The key word for the French was mobility, there the Valliere system was miserable for the sort of field warfare in the 7YW - therefore pieces like Rostaing or à la Suedoise had to be invented to fill the need for the French armies of the 7YW to handle artillery at least a bit mobile, by no means competetive enough for the Austrian and Prussian guns at that time.
Gribeauval took a good look at the Liechtenstein system and donated the French army an artillery system which would be on par compared with the other systems at those times. So far for the French Army a good improvement - for the rest of the main powers in Europe not so sensational.
But it was a good solid system.
The Gribeauval system as such was again overhauled by Masson, see the comments of Dr. Stephen Summerfield and then again, we don't know what kind of guns the French used in the French Revolution there they lost an immense ammount of guns but captured a huge amount as well (see Napoleon's own observation about the number of guns in the Armée d'Italie - about this).
A fascinating topic which needs more research.