Remember this?
A serious bug in macOS High Sierra that enables the root superuser on a Mac with a blank password and no security check.
There was a few other major security issues in the last 3 or so years.
But that one above is probably the worst in years from any operating system.
(Excluding hardware bugs like Meltdown/Spectre, that were probably the biggest security bugs in years.)
If you have PHYSICAL ACCESS to a computer, I don't see how that's a huge security issue. If it's over the internet, then yes, any flaw is worse.
You can easily create a new password to get onto a mac laptop where you forgot the password (or stole). No problem if you have physical access to the laptop. I don't see how this is any different.
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