And that reluctance comes from being mentored by senior software engineers who have been burned by using the latest shiny, and appropriately mentor the junior developers against using the latest shiny. We .Net developers build mission-critial enterprise apps using only the .Net stack, and most senior .Net devs would applaud one in doing so. Now I'll admit that the .Net stack is a moving target. But I'd rather have one commercially supported moving target than a dozen OSS moving targets. No rational person likes having their head explode. Being "free" has nothing to do with it.