On leaving academia, interdisciplinarity, co-authorship, and other things

Zachary Ernst, we're sorry to see you go.  But you've left us with some important issues to mull over, here.

These even includes some issues that are under faculty control, like the following:

Furthermore, my department also considers single-authored work to be more significant than co-authored work. Frankly, I find this policy totally absurd, but it's not that uncommon. Because a lot of interdisciplinary work will appear in unfamiliar (to one's colleagues) venues, and be co-authored, that work is downgraded, not once but twice. The effect is that when it comes time to decide on salary raises, a faculty member with broad, interdisciplinary research interests is at a severe disadvantage. To put the point bluntly, interdisciplinary researchers get paid less.

Is philosophy really so insular that we can't respect interdisciplinary work?  That we can't recognize the extra effort (not less effort) that it takes to collaborate?  I am afraid that I know the answers.