This allows a user to opt into pcrs if they understand what they are doing.
Some PCRs are sensitive to firmware updates and some are sensitive to boot loader, kernel, boot config, or initramfs. All of these are an opportunity for an unsuspecting update to remove access to the boot volume. There are update processes that can be put into place to make this work,
but it is up to the OS update process to address that, and
OS update processes are likely not to address that at this time.
Jarrod Johnson
94c1683663