What's important about the old books and theories is that they teach you that science is invention and discovery and being wrong, not memorizing rules and solving already -solved puzzles. If you only learn from modern textbooks, you get the wrong impression that these biblical tomes are what science is. Science is about finding patterns and creating order out of chaos, not memorizing the order someome else creaymtes.
They don't teach you that any more than current books do.
You might gain that because you compare the two and notice the old books are obviously wrong against new data ... something the current books happily tell you too.
