ModContent

[Metacinnabar]

Convert mod.ItemType("CoolItemClass") to ModContent.ItemType<CoolItemClass>() while automatically adding the using statement required.

[JavidPack]

No, because that isn't always correct.

[Chicken-Bones]

I'm actually in favour of making this a suggestion. You can check if "CoolItemClass" exists in only one namespace within the mod project. If it does there's a fair chance that it maps to the string via autoload. People manually registering string -> item probably don't use the classname.