No, nothing you said negated it. I was just trying to clarify my understanding and my position. I have a MPK (24 seed words), but I don't know the unique private key(s) to the hundreds of public keys that I generated between my BTC wallet, DASH wallet, and ETH wallet on the Trezor. As I now understand it, I don't need to know those private keys because the MPK generates them (all private keys are stored in/ under the MPK).
I agree on your assessment of the Trezor, which is why I store close to all my BTC, ETH, DASH, and ZCASH on it.
@jamesbrown Sorry I didn't reply for a couple of days, I was on a flight from Bangkok to Amsterdam.
As to Trezor, if I'm not mistaken you have many encrypted private keys on your Trezor which can only be decrypted with your unique MPK.
No prob. I'll figure it out when I have to. For now, it's good enough to know that the MPK is the "key" that gives access to real block-chain ownership (private keys).