Thanks for your reply.
Yes, I spend entire weekends starting with browning veal and beef neck bones, making the brown stock, then canning some of the brown stock ( I actually have two stock pots going, one veal, one beef, and can them separately too), reserving enough of the stock to make the Espagnole sauce and still having enough stock left to go for the Demi-glace, once the brown sauce is completed. (I've heard that there are shortcuts eliminating the brown sauce step and going straight from stock to Demi-glace, but frankly, I love cooking so much I don't mind doing it in the traditional classic manner!)
I've also reduced left over stock down to GDV and put it in the freezer, frankly because we were running out of mason jars. :)
What I was trying to understand with my first post, was the subtleties of using one vs. another.
If I understand your reply, the Demi-glace is too flavorful for some dishes, where a simple brown sauce would be better? But didn't Auguste Escoffier describe Demi-Glace as "the perfection of brown sauce"?
Taking that at face value, then a simple Espagnole sauce would be "imperfect"?
And being like I am, I was wondering if ever there were ocassions where one would not prefer the "perfection of brown sauce" over "just brown sauce".
Thanks,
deltadoc