I'm kind-of into old techniques and crafting styles. I live in the forest, so it kind of lends itself to that.

I agree with you. I have piles of books detailing very old crafts like processing game, tanning hides, trapping, hunting. Knapping stone tools, weaving baskets, raising pole barns, distilling whiskey at home, making clothes, mending clothes, herbal/wild medicines. The foxfire books being a great example of how we preserve this knowledge.

Almost anything modern we've learned is going to be well-documented IMO. We may not be referencing those documents any longer, but they exist, and will exist for a long time.

And also agree that modern methods tend to be better, or at least the best version of the old methods is widely known, thanks to youtube etc. Primitive Technology on youtube, for instance, was able to launch himself into the iron age without bringing any modern tools along. But the access to modern informational sources makes him a primitive powerhouse.