Automotive varies widely between "basically modern Linux systems with proper updates" and the most janky, home-grown update systems imaginable, sometimes even within the same components and teams.
Yah, I know from friends at ford and vw that there's still vxworks and qnx, but even there, good grief, a-b with confirmed boot is about as basic as you can get.
I confess I've seen incredible sloppiness about when a confirmation is done (too early, including in the initial init stages which is way too soon) and watchdogs (spawn off a process that has a while loop stroking the wd - just absolutely pointless).
I've heard all of the above, often "stroking". I never used those because I like systems where you have a random challenge code to respond to. Then the software has to not be acting as wonky to react correctly.
Indeed, a good RTOS from 10-20 years ago works just as good now as it did back then. The only things that change are dev environments and the driver support.
I confess I've seen incredible sloppiness about when a confirmation is done (too early, including in the initial init stages which is way too soon) and watchdogs (spawn off a process that has a while loop stroking the wd - just absolutely pointless).