Hybrids likely have more engineering around the start-stop cycles than full ICEs with start-stop bolted on to meet emissions requirements.
The prius style dual motor/generator planetary gear arangment avoids concerns about starter motor longevity. But the engines and how they're managed is tuned for their use case.
I'm sure ICE with start-stop will get there eventually, but the automotive industry tends to learn to build reliable drivetrains through a history of failure. From my experience with a couple rental cars a year, on user experience, start-stop is all over the map from really annoying to noticable but unobtrusive ... I imagine how design challenges around lubrication are met is also all over the map.
The prius style dual motor/generator planetary gear arangment avoids concerns about starter motor longevity. But the engines and how they're managed is tuned for their use case.
I'm sure ICE with start-stop will get there eventually, but the automotive industry tends to learn to build reliable drivetrains through a history of failure. From my experience with a couple rental cars a year, on user experience, start-stop is all over the map from really annoying to noticable but unobtrusive ... I imagine how design challenges around lubrication are met is also all over the map.