the books are indeed not that old. The oldest I have is 31 years old (Uhren Von Patek Philippe Exemplar Limitierten Luxusausgabe (Limited Deluxe Edition )
This book contains mostly pocket watches.
I think that Patek switched from complicated pocket watches to complicated wrsitwatches. The pocket watches in these older books are mostly complicated pocket wristwatches. The wristwatches were simple and not that often complicated. Today the demand for complicated pocket watches is very small and like you said, the demand for complicated wristwatches is huge. So they put all their knowhow in complicated wristwatches.
Things change and imo icons change too. I would dare to say that the complicated wristwatches and especially chrono and chrono perpetual are the new icons