[manigandham]

"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.