Until .NET Core provides support for many of the .NET Framework APIs still lacking from .NET Standard 2.0, many companies won't consider it "enterprise grade".
Examples on our case, WPF, WCF, ODP.NET drivers for ADO.NET.
Examples on our case, WPF, WCF, ODP.NET drivers for ADO.NET.
It took a Microsoft that understood open source and non-Windows platforms, and was serious about it, to ultimately get us to the point where .NET Core could be a thing.