If it’s on my computer, I should be allowed to read and write to it. End of story. I don’t care if that makes it vulnerable. So far as I’m concerned, letting Microsoft keep secrets from me on my own computer is similarly catastrophic to losing my HD to a crypto-locker virus.
This is exactly what a TPM was made for, so your statement is a little bit paradoxical.
The problem is third parties using TPM/SecureBoot/etc as a weapon against the owner via remote attestation, by preventing them from configuring their own device, with the threat of being cut off from critical services.
Having the upside without the downside would be nice, but how could it work? Is a technical solution feasible, or would it need a law/regulation?