I am trying to keep my pageObjects in Protractor as clean as possible, but have run up against some behavior in selecting sub-elements.
This works:
v
You could use the locator() function to get the locator of the child element and use it to find a child of the parent. This is similar to the solution you provided in your comment, but allows you to define all properties on your page object as web elements instead of a mix of elements and locators:
var parent = element(by.css('.parent-class'));
var child = element(by.css('.child-class'));
parent.element(child.locator()).getText();