Brendan Eich wrote:
* __proto__ is widely used, especially on "the mobile web", which is not "the web" that many who focus on desktop see or think of when authoring. Thus Zepto's use of __proto__, but not of __define/lookup....
To sharpen this point, Zepto does use Object.keys without polyfill. This is an ES5 method. WebKit on "the mobile web" has ES5 support sufficient to obviate the need for __define/lookup... but not the need for __proto__.
This is the pressure IE and any non-WebKit browser lacking __proto__ support faces on mobile.
Another way of looking at it: ES5 happened and it is relied upon by mobile content authors, but ES5's Object.create is not sufficient to eliminate uses of __proto__, e.g. in Zepto.
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