In comparison to some absurdist baseline maybe, actual software NEVER stops working under you, so in comparison something like an works 80% "most of the time" is godawful. Though I would argue that with SaaS the trend is toward 100% likelyhood to fuck your shit up given enough time, and it has borne out this way in the real world time and time again. SaaS is popular because it allows companies to more effectively extort you for your dollars.