It is an additional measure that can help you in case of bugs. If I have a vulnerability, in a service, that let you get root privileges on a machine, I can still prevent you from changing vital components because of the hardware protection. A reboot will make sure my machine is not compromised because I know you were not able to change vital system components like the kernel as you don't have the signing key I keep offline.
Simpler to store the kernel on a read-only media than invent a chip with the sole intention to cripple things for everyone else (that is what DRM/TC does in the end after all).
So far people have come up with ideas that would somehow make DRM/TC "useful", but all of these ideas are perfectly possible without using crippled hardware with systems made decades ago.
As I said before it's the use you make of a technology that is good or bad, and I agree that using TC/DRM against a user is bad. But this does not make a Fritz chip bad per se.
How else do you use TC/DRM unless it is against a user?