Don't break the web. Those who don't like old features just don't need to use them.
Applications that do use them would break! If reducing the available feature set would increase performance then a declaration to the browser to ignore deprecated features should be enough to get this optimization, but only for this reason. But do we even know that there is any performance gain for doing so? I'm not bothered about browser code complexity to support old features - I don't see that code anyway. I don't know to what extent other javascript developers are bothered about it either.
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