An interesting discussion on the topic, suggesting that egos play a role:

Another challenge is the “rock star” syndrome. Also as with law, doctors – and to a lesser extent, nurses – go through a very long and arduous training program before they’re allowed to practice, and it has a significant rate of failure. Along the way, many doctors (and lawyers, along with celebrities of all stripes) end up with, shall we say, egos of a size that’s a bit larger than is the case with most of us. The focal point is the practitioner, not the process or the enterprise, so avoiding this outcome requires a strength of character that not everyone has.

Many physicians are stubborn and old habits die hard. To convince them, you have to appeal to their bottom line. Forget the fancy bells and whistles. There are 3 things that appeal to doctors: i) EHRs must decrease the time spent charting; ii) capture more appropriate (often higher) coding via improved documentation; and, iii) allow the provider the opportunity to see more patients in the same amount of time (i.e. increase efficiency). Unless these three specific criteria are met, there will be continued resistance to EHRs.