Deploying some sort of TPM remote attestation for DRM requires every component from every vendor to play nice, so I don't think you'll ever see that rolled out for Windows.

I would guess that the actual push for TPM is to have 'better' BitLocker, and Passkey support.

In practice the default BitLocker+TPM configuration isn't that great (no user entropy/pin, dTPM is basically worthless).

I have no actual understanding for how TPM is involved for Windows Hello/WebAuthn/Passkey or whatever, but at a glance it would seem Biometrics without a TEE seems like a very weak link.