What does inherit! :search_paths do?

After looking at CocoaPods' own example (from https://guides.cocoapods.org/syntax/podfile.html#abstract_target)

# Note: There are no targets called "Shows" in any of this workspace's Xcode projectsabstract_target 'Shows' do  pod 'ShowsKit'  # The target ShowsiOS has its own copy of ShowsKit (inherited) + ShowWebAuth (added here)  target 'ShowsiOS' do    pod 'ShowWebAuth'  end  # The target ShowsTV has its own copy of ShowsKit (inherited) + ShowTVAuth (added here)  target 'ShowsTV' do    pod 'ShowTVAuth'  end  # Our tests target has its own copy of  # our testing frameworks, and has access  # to ShowsKit as well because it is  # a child of the abstract target 'Shows'  target 'ShowsTests' do    inherit! :search_paths    pod 'Specta'    pod 'Expecta'  endend

I don't see why inherit! :search_paths is necessary? All 3 targets, ShowsiOS, ShowsTV and ShowsTests have access to ShowsKit from their parent target.

The specific example for inherit! (from https://guides.cocoapods.org/syntax/podfile.html#inherit_bang) doesn't add any clarity

target 'App' do  target 'AppTests' do    inherit! :search_paths  endend

Can you help me understand what inherit! :search_paths is for?