It would eliminate that fear of forgetting the key. Again, it comes down to your threat model. Key stored in more locations is potentially compromising securit

It would eliminate that fear of forgetting the key. Again, it comes down to your threat model. Key stored in more locations is potentially compromising security, but is a trade-off everyone has to consider. It still prevents disinterested drag-net style data leakage. If you are targeted by the big bad, I doubt my operational security would be sufficient to protect me from a motivated attacker. I suspect that there are vulnerabilities in my TPM/random number generators/encryption software that are exploitable. An evil maid or even just a camera positioned over my keyboard would probably be sufficient to grab my data. Plus those $5 wrenches.