It's my computer, I should be at the top of the permissions totem pole, not Apple. If they're dead set on using signing to enforce the higher-than-root level, then I should be the one signing the executables. Fortunately, you can disable this crap.
But for those of us who need that access we can disable it, with a bit of a dance to make it hard for people who _don't_ need it.
"General purpose computing" is a niche market. Most buyers would be more than content with a machine that lets them run the specific software they need for their specific use cases, and otherwise protects them from executing malicious code. Joanna Rutkowska's "evil maid attack" is a real security threat; and one of the edges that Apple has in the marketplace is being one of the first vendors to design practical, evil-maid-resistant personal computers.
Here are the instructions to enable logging in as root, since privilege escalation seems inconvenient for you: