I don't know where you get that expectation from. These are arbitrary engineering constraints informed by business decisions. If they decided that people could

I don't know where you get that expectation from. These are arbitrary engineering constraints informed by business decisions. If they decided that people could deal with up to 30 minutes of service interruption and set that as a goal, they would engineer with that in mind, regardless of how many people. If they used total combined user hours of interrupted service, then they would engineer around reducing possibly outage times for a system as it handled more people (or scale differently, with more systems). I don't think there's any sort of expectation that it would definitely go one way though, as you say. It's all business and legal constraints providing engineering constraints to build against.