I‘ve been playing the guitar for very long, and it occurred to me that physical health correlates with my ability to synchronize both hands. Having a steady hand helps tremendously with that IME. I noticed e.g. when I quit drinking (even occasionally) that I got way better at this. While typing, I also started stumbling way less over complicated words at that time.

Practice did help too, but tbh, I practiced a _lot_ and it was frustrating seeing other players be so much more accurate than me while I had likely practiced just as much. Being healthy is just a competitive advantage.