I am so glad to have been of help
GAC was spearheaded by Aldo Gucci (and his sons) and was supposed to be a more commercial line but only sell literally Gucci accessories (which is why the original 1979 range boasts only smaller bags no bigger than a med Boston). In reality GAC was a political move because Aldo wanted to go more mainstream whereas his brother Rodolfo was more conservative and wanted to maintain Gucci's prestige.
The earlier GAC products of their day are scarily well made, which just goes to show how amazing their mainline of products must have been. Rodolfo Gucci died in 1983 which must have loosened Aldo's restraint. That, coupled with the popularity of the GAC products in just a few years meant that production had to increase hugely. Outsourcing, over-extending the product range and availability may be why some of the mid to late 1980s GAC bags (among others) are not thought as good quality (never mind the strange goings of on of Paolo Gucci, one of Aldo's sons).
Gucci employees still tend to call their classic lines of canvas mono bags 'commercial' even though in some cases they are just a few dollars less than their leather counterparts. I think there is a role for all types of bags, even for the same person for instance, I would happily take a Gucci-plus Boston on a picnic but probably not a pythton handbag.
FYI, I see that Wikipedia's Gucci history is littered with flaws and especially inaccurate about dates of innovations. There are some very good books on Gucci's history including
Gucci: The making of that are very interesting and you might like to check out