Hmmm...

I suppose in some areas like the middle east and north Africa simply sifting trichomes off the dry plant, then filtering them through ever smaller screens before pressing them is traditional...

However,

Most "charas" in India is produced by picking an oil saturated bud and lightly rolling and rubbing the bud on your palms, over time and after several buds a thick sticky residue will build on the hands, with is then peeled off and rolled into bars, this is the method used to produce most the "charas" in the Himalayas regions and in India...which in a sense is much like rosintech in the end product.

...there were stories of the hash villages getting their most beautiful virgin girls and making them run through the cannabis field naked, when the girls emerged covered in resin, hot/warm knives were used to remove the residue from the girls skin, the residue was then pressed into bars...like hand charas but in mass amount.

Then there's "bhang" which was cannabis infused milk with butter added, which was traditional in India...

I still see bubble hash as old school, however the history of cannabis spans thousands of years, the the term "old school" is rather subjective.

They never found any utensils for consuming this cannabis in the grave with this "gushi shaman", it's possible it was consumed in a drink with milk like "bhang", or maybe it was smoked, buy then why no pipes burried?

Regardless, "old school" spans thousands of years and many cultures...

-eg