You're phrasing it as if there is a solution people are purposely not adopting, but there isn't one. There is ongoing research to find privacy solutions that /do/ work
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It's news to me that the existing privacy solutions in the space such as Zcash shielded transactions, Monero, Tornado Cash, etc. aren't usable. I don't see much innovation or research in that space coming from the Bitcoin world. If they are, who is working on it and where is it?
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Don't consider it to be the same class of approach as shielded transactions. Monero is not quite based completely around encryption and still relies on obfuscation to an extent but they're very slowly working towards it. I don't really see any progress towards it for Bitcoin.
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Being able to generate static addresses and privately receive money many times including directly to a hardware wallet and then being able to use the funds normally to privately send any number of transactions to any number of addresses is also a lot different.
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Self-custody with layer 1 on Bitcoin is already pushing the limit of what most people can be expected to handle. Safely managing their own keys with split backups and then sending irreversible transactions is a lot for most people. Can't make it 100x harder. It won't be adopted.
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Strong on-chain privacy would mean having the same usage pattern as existing layer 1 Bitcoin usage but with everything being completely confidential via encrypted. The technology for shielded transactions exists. If privacy was a priority it'd be deployed and regularly improved.
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Taproot was super hyped up but it's incredibly boring and doesn't really improve privacy. It only theoretically helps improve weak obfuscation-based privacy if it had majority adoption. It doesn't help typical Bitcoin user much. It saves them a bit on fees if they use multisig...
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Taproot allows me to make complex decaying multisignature scripts without revealing what they are and who they involve....
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Still lacks privacy in almost every regard and reveals it when you use the functionality. As I said, it doesn't help typical Bitcoin users much beyond saving them a tiny bit of money on fees if they use multisig. It's presented as a huge upgrade but Bitcoin still lacks privacy.
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~0.6% taproot transactions so making multisig look the same as a single signing key and more complex scripts look the same until you use them doesn't really have privacy benefits right now because adoption is low due to lack of compelling reasons to switch to it for most people.
It was /just/ activated. Bitcoin being an actual decentralized chain means adoption takes a while
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Bitcoin mining is hardly decentralized and the vast majority of users don't use their own nodes. I'd be interested in knowing how many people owning Bitcoin even do self-custody. At this point it largely exists for people to speculate. That's why fees are low, not Lightning.
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