I think the conclusion we can draw from this discussion is that dismissing Microsoft-stack developers is a terrible generalization.
Agreed in full; see my other post in this thread.
> I've seen a ton of reticence around using anything with an OSS license.
Very true. This used to be a point of contention where I work, but was easily fixed by having an automated process for getting our lawyers to approve OSS code (with a Nuget or Github URL). We still have to do it on a per-project basis (not per-license), but we're using lots of OSS code now and I've made a little headway on open-sourcing some of our own stuff.
These days OSS advocacy isn't that hard, especially with the hard facts demonstrated by CoreCLR.
Coming from a Mono background, this was very weird to me.