The start-stop deal is for CAFE standards test as much as anything.
The starter engagement is often a starter-generator thing at the flywheel, I think.
There's no starter sound on the '23 RAV-4 rental I have, but I turned it and another nanny off.
At a stop, if you just exert enough pressure on the brake pedal to hold the car, it keeps idling.
Push harder, or turn the nanny on, engine stops 'til you push the go pedal.
Pretty seamless, but I'm not a fan.
And that stuff's gonna be spendy when it breaks.