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They're just an added cost option. TPMs are basically useless for unattended boot because if you *really* want the key you just hook up a logic analyzer and sniff it out. I've done that with BitLocker.
So the threat model isn't much different from just having the key in a UEFI variable, against a skilled attacker. And the goal here isn't to protect against physical access attacks, it's just to keep the drives encrypted.
![Adam [he/him]](https://pbs.twimg.com/profile_images/2328235588/mky7liyb93paqco9cfuk_normal.gif)
