Tab Atkins Jr. wrote:
In reality, only the web-exposed parts are,
What is not web-exposed here, pray tell?
and then only the parts that the web actually depends on.
This is the part we can't determine. "The web" is not just the Google-indexable (by what user agent?) part, but paywalled and intranet content as well. I've written before that finding true positives helps reject a proposed incompatible change, but finding no positives does not prove that we can make the change.
Furthermore, the first browser to roll the dice and face breakage loses, making implementors generally unwilling to take even likely-small risks. This browser Prisoner's Dilemma can be helped by cooperation, e.g., among TC39ers, but even then only for a big enough payoff. See the typeof null == "null" attempt early in ES6 development for an example.
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