I think you hit the nail on the head. I've been consulting for a number of years and in every organization I go to, there are inevitably other consultants who know the one "true" way to do something.
Regardless of whether someone else on the team writes easily readable, tested, working code - these consultants will inevitably complain it's done incorrectly and refactor it to their vision. This wastes time and money, and more often than not I've seen it lead to regression bugs in the software.
The man is the greatest philanthropist of our time. He's doing more for the world than everyone commenting here combined, to some outrageous exponent. Decry the man's business practices, but at the end of the day it was a means to an end. He's taking his wealth and spending it wisely on charity. Further, he's convincing other billionaires to do the same. I say we leave his tenure at Microsoft in the past and focus on the stuff that will truly be his legacy: helping mankind. And for that, I say, good for you Mr. Gates.
Regardless of whether someone else on the team writes easily readable, tested, working code - these consultants will inevitably complain it's done incorrectly and refactor it to their vision. This wastes time and money, and more often than not I've seen it lead to regression bugs in the software.