Re: [whatwg/dom] [Proposal] Add EventTarget.getEventListeners() (#412)

> Is there a reason that an opt-in mechanism (at the addEventListener callsite, like how passive: true works) wouldn't be a good middle ground, where you could get the functionality you want with zero risk of breaking existing axioms, and zero risk of developers having difficulty reasoning about their code?

One of the most basic HCI (or human psychology in general) principles is that when something is opt-in, few do it. Most of the time because they simply never considered it. Therefore, it renders the feature useless for libraries, and only helps in reducing coupling in one's own code. Opt-out might work, like a `stealth` option for listeners.

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