But we're not talking talking about some niche, low-level, closed source OS, written exclusively for tiny footprint mobile devices with 200MHz CPUs and 256KB of RAM, like Symbian was, we're talking about a non-niche OS that has a sane and popular base (the Linux kernel) that's well documented, has an abundance of devs with experience, and quality tooling, running on powerful modern hardware. I'm sure it's possible to update it for 15 years.

The difference between developing for Symbian and developing for Android/Linux is not even night and day, but night on Earth and day on Saturn.

Microsoft updated Window XP for 12 whole years, and even longer for paying customers like governments and military. I'm sure they can do 15 years on Android Automotive.