I was talking about availability of hardware capabilities. And having a common interface to them so they are actually useful. Several of the machines I work on have a SAM, TPM, HSM chip or similar. But they’re not always present and they don’t necessarily have nice interfaces that makes writing software that works everywhere easy.

These are all running proprietary software that you can't upgrade. As an example, Yubikey had a bug a while ago where they were generating weak keys, which could be recreated from a bunch of signatures.