Ron,
I think I see what you are asking. I do not believe many, if any, LR were built by grizzled old men sitting under a tree using a pocket knife. We know from records that apprentices were used, that locks were bought premanufactured by the most modern methods, barrels were made in factories and shipped over from Europe to be sold to gunstockers and then were used to shoot redcoats, indians, bears, and each other.
CNC replaces apprentices. The gun trade guilds of England were the CNC of the period. If they could have bought precarved stocks, I suspect they would have used more than a few.
Acraglass is not a wonder tool, it replaces skill in inletting or the need to properly stock a modern rifle. If it is used to repair an error in worksmanship, it is a shortcut to inletting a wood patch. Acraglass will not provide a more accurate rifle than restocking properly. It was originally intended as a way to take a low priced and mass produced stock and make the action fit like a well made custom rifle. It is a gunsmithing shortcut, a time and money saver.
I think, just my opinion mind you, that the current use of purchased barrels and locks is following in the footsteps of the original makers. The lack of use of acraglass is because the builders here know how to do a stocking up job properly, so they do not need to mess with it.
Does that answer your question?
DAve