I think there's a selection effect there too - or equivalently, maybe the causation goes the other direction. If you tend to think in terms of first principles

I think there's a selection effect there too - or equivalently, maybe the causation goes the other direction. If you tend to think in terms of first principles, you're more likely to have boarded the FOSS bandwagon in the first place. If you think in terms of tasks and practicality, you're more likely to have chosen to work for Microsoft. Each ecosystem reflects the principles of those who join them.