Keep in mind that when those people were hired, there was a lot of maturing that needed to be done in the computer space. These people are titans by today's standards because the timing of their arrival on the scene had much to do with the amount of influence that they had. If you were to take ANY of Charles Simonyi's recognizable mainstream achievements (most notably Word and Excel) from the 80s and transported them to a startup today, they would hardly amount to a drop in a bucket (of course this is subjective, but I think you get the point!).

Today technology is commonplace and more widely distributed. I would place danah boyd in the same category as those you have mentioned because of the fact that the computer/tech/internet worlds are so much larger than it was in the 80s. She is a leading intellectual when it comes to social networking and I hope she has some influence at Microsoft in a positive direction. Because of her large amount of knowledge in the technology space as it applies to its social impact, this is indeed a key hire for Microsoft as they struggle to make heads or tails of how companies like Google and Facebook have had such a huge following.