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Re:Astonishing Performance of .NET 5 by christophilus on Thursday November 12, 2020 @11:39AM (#25071609)
Not the OP, but I never used .NET core, but used DI pretty heavily for most of my 15 years writing C#. It was there before .NET Core. Maybe you mean it's improved with .NET Core?
Re:Astonishing Performance of .NET 5 by manigandham on Thursday November 12, 2020 @12:20PM (#25072046)
"wasn't as prominent or included in the framework itself"

There was no built-in DI container before, you had to use your own like Windsor/Autofac/Ninject/etc, and it wasn't as popular because of it as many people skipped it for smaller/less enterprise projects. I'd say exposing more people do it, even if the built-in DI is rather basic, helped improve many new projects that otherwise might not have chosen to do so.