Start-stop is harder on the engine (bearings) than idling would ever be.
Every time you stop the engine, especially hen hot, the flywheel end main bearing sits down hard on the bottom shell of the last main, and the accessory belt end is lifted pretty hard against the top shell of the front bearing.
When you crank it to restart, these two interfaces are metal/metal (well tribofilm/tribofilm) until the oil wedge is established.
Like MANY of these fuel saving strategies, they aren't being done to make your engine last longer.
And if I'm wrong....then why are engine bearings these days being designed with "stop start" requirements in mind ?
Never heard of a bearing design being specifically for idling.