bitcoin won't just magically add privacy. you want something added to bitcoin, open a pr. its open source software.
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People submitting high quality pull requests implementing protocol changes isn't how Bitcoin works at this point. In the early years? Sure.
Solving it is almost entirely a political issue, not a technical one. Zcash already made the technology needed to deploy this for Bitcoin.
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There was just a soft fork last year to add support for Schnorr signatures. Why couldn't a PR to add Zcash-like encryption follow a similar path to get merged and activated in bitcoin?
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Well what you propose carries untenable validation cost tradeoffs
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In your opinion. Although without a concrete proposal I think it's premature for you to come to that conclusion. Maybe the costs are actually less than you think, or maybe they can be offset or moved "somewhere else" (like a drivechain or rollup) so L1 full nodes don't notice.
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The original approach required a trusted setup ceremony which also applied to Tornado Cash and other systems based on it. z.cash/upgrade/nu5/ replaced the trusted setup for the new shielded pool.
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The damage from a counterfeiting bug in a shielded pool is contained to that pool by tracking the overall balance and forbidding it becoming negative. I'd assume Bitcoin would contain the risk the same way. People would decide if it's a risk they accept just like using Lightning.
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That's why they make the new shielded pools instead of extending it within one, so the attack surface for a given era of technologies is contained to that pool. Eventually people that are still active would move their money to a newer one once they consider it mature enough.