The reason why TPM functionality was so much hated upon is because
it was pushed by a software/hardware monopoly, not just for DRM but
for locking down the system in general.

Regardless of what some people might have imagined or extrapolated at the time, the actual published specifications and technologies were nothing like that. There has never been a TC/TPM mode that would have generally locked systems down or even been useful for DRM (that'd have required a trusted hardware path which was never specced nor implemented). 

Locking a system down against tampering or for DRM does not require flexible open specifications with multiple competing implementations. It requires you to do an Xbox 360.