Sorry you feel that way but there’s a few million developers than disagree. .NET Core is all over. I’d encourage you to use your existing C#, .NET, and NuGet knowledge and spend a weekend getting up to speed. You’ll find it’s fast, cross platform, open source, flexible, great in containers, cloud agnostic, and pairs well with VS, VS code, and VS4Mac. It changes less than you’d think from a learning perspective but changes everything from an industry perspective. Plus targeting .NET Standard means your code runs everywhere from Apple Watches to Raspberry Pi to Azure. Take a few days and transfer your knowledge.
Can you expand on why you feel this way?