Are you kidding? The notion that people (even talented people) can be swapped in and out every 12 months is a far greater assumption that people are cogs. From

Are you kidding? The notion that people (even talented people) can be swapped in and out every 12 months is a far greater assumption that people are cogs. From a co-worker perspective, yes, I'd rather work short-term with someone talented. From a managerial perspective, I'd first choose the talented employee who has demonstrated an ability to commit, then I'd choose a less talented (but with potential to improve) employee who I believe has an ability to commit, then it's roughly a tie between someone mediocre and someone talented who will likely abandon their project in the lurch. Those last two are both pretty lame options.