Why bother with providing userland tool then? If you have complete chain of trust, the tool can just MsgBox("Everything's OK") because you wouldn't be able to b

Why bother with providing userland tool then? If you have complete chain of trust, the tool can just MsgBox("Everything's OK") because you wouldn't be able to boot OS if EFI didn't pass the check. If you don't have a chain of trust, the tool can be easily tampered with by the rootkit. Either way - it serves no real security purpose other than perhaps reassuring user or detecting obsolete, existing rootkits.