FWIW, I've worked on systems that have internal SLAs orders of magnitude higher than what they promise to the public. I think it's more just that there's no ad

FWIW, I've worked on systems that have internal SLAs orders of magnitude higher than what they promise to the public. I think it's more just that there's no advantage to doing something like this as long as none of your competitors are. The status quo is that people's systems are really opaque and vastly underpromise what they should be capable of, and in exchange you get to absorb some unplanned downtime due to issues with underlying systems that you have little control over.