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You're just offering non-helpful ivory tower criticism without even understanding the problem space (which is actually one of the hardest open research problems in software engineering, cs.PL + formal methods).

But if I'm wrong, dare say, how would you write a production memory-safe JIT compiler today?

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If I couldn't guarantee memory safety, I wouldn't. We're talking about an optional feature for JavaScript engines.

Security is where the rubber hits the road. It's whether customers' identities get stolen. It's whether leaders of undemocratic countries can monitor communications, locations, and social networks of people whom they oppress.

Calling this an "ivory tower" criticism is, ironically, a lack of acknowledgement of reality and that our actions have consequences to others.

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