All this does is changes the "core" library for CoreCLR to be renamed from "mscorlib" to "System.Private.Corelib" -- this has an important function, now the .NET team can add more backward compat features (missing types and methods) to mscorlib for those who want to use it.
If your library or product doesn't want to use it, you don't need to.
.NET Core doesn't become more bloated, it says beautiful and Core.
I implore you to take a look at this pull request:
https://github.com/dotnet/coreclr/pull/4874
All this does is changes the "core" library for CoreCLR to be renamed from "mscorlib" to "System.Private.Corelib" -- this has an important function, now the .NET team can add more backward compat features (missing types and methods) to mscorlib for those who want to use it.
If your library or product doesn't want to use it, you don't need to.
.NET Core doesn't become more bloated, it says beautiful and Core.