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Given that the thing we want to support can be supported via server-side translation, client-side translation in JavaScript, or automatic detection and translation via a third-party plugin in JavaScript... What bearing on the open web does it have to preserve this functionality as a JavaScript-accessible API built into the browser?

I don't see how removing this API harms the open web. I do see how it imposes some nonzero cost on website maintainers to adapt to the removal of the API, and I respect that cost is nonzero.

... but I also watched OpenGL evolve into OpenGL ES and the end result was a far better API than we started with.

I don't think XSLTProcessor joining document.defaultCharset in the history books is damage to the open web.

ETA: And not that it matters over-much, but the "overpaid Mba" is an electrical engineering Ph.D who came to software via sensor manufacturing, so if you're going to attempt to insult someone's training, maybe get it right? Not that he'd be wrong if he were an Mba either, mind.