If we take a look at Patek Philippe’s Advanced Research we learn that their greatest achievement thus far is a rate of -1 to +2 seconds per 24 hours. So +/- 3 seconds a day. If Seiko already did that almost 50 years ago (!!!) we can safely assume no more noticeable progress will be made at all when talking accuracies.
Plus we should worship Seiko a lot more and Patek less...
Back on topic:
So it is indeed the science of materials where the most innovations have been made.
Now what will be the next great innovation in watch making? 3D printing?