This is not running it as root (i.e. privileged userland, still ring 3), this is running it as ring 0 (i.e. the level that the kernel runs at, with no restrictions on access to memory and hardware at all). A tiny bug in ring 0 code can take down the system or open security vulnerabilities, where the kernel can provide more hardening to protect applications to an extent.
You could say this is the inner circle of hell.
I think that many historic trades have been automated to the extent their old terminology is obscure but lives on in idioms.
“To the bitter end” (bitter end meaning the lose end of a rope, from rope-working - not entirely extinct but obscure). Perhaps that one could be “To the edge node”!
“Strike while the iron is hot” (from blacksmithing, again not entirely an extinct craft but largely replaced by automation). Maybe “Cross while the light is green?”