At least HVAC systems have a mostly standard control system and thermostats are easy to swap out. If a thermostat goes out of support and looses functionality, you do not need to replace the entire HVAC system; only the relatively cheap thermostat.

I'm contrast, while it is often possible to replace an infotainment system, the replacement needs to have been designed for a fairly specific set of cars, and actually installing it requires paying a mechanic for most people.