This reminds me of a visit to an Equinix data centre where the sales person was droning on and on about how incredibly reliable their power supplies were, how uninterruptible everything was, etc, etc…
Essentially, he was trying to assure us that no-no-no, we don’t need multiple zones like the public clouds, they can instead guarantee 100% uninterrupted power under all circumstances.
A bit bored and annoyed, I pointed to the giant red button conspicuously placed in the middle of a pillar and asked what it is for.
“Oh, that’s in case there’s a fire!”
“What does it do?”
“It cuts… the power… uhh… for the safety of the fire department.”
“So… if there’s a wisp of smoke in a corner somewhere, the fireys turn up, the first thing they do is… cut the power?”
“… yes.”
“Not 100% then, is it?”