What herby said is the reason. There's no compatibility burden for either those or __proto__ because no version of IE implements either. However __proto__ still has no alternative, while the accessor functions are fully replaced by ES5 features.
The only code you'll find in the wild that relies on the accessor functions is either extremely outdated and non-interoperable web code or lazy Node.js targeted code (I still don't get why these ever started showing up in Node.js code, but they do).
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