If I'm thinking about adding a third party library to my code base I don't want to have to ask my lawyer to go through the license. Because then I get a bill in the mail. It's that simple.

The APL is a common license. It would serve you well to learn about it instead of talking hypotheticals and expecting everything to be MIT.

Well I don't really see why you can't add an apache2 library to any project. The sole limitation is that you must must publish back any change you made to that specific library under the same license.

Apple for instance use Apache 2 for Swift and they clearly aim at closed source project to use it as a library. So what's the matter?

it's all good. i'm sure they won't mind if you don't use it.