I have considered getting a Subaru Outback, a Toyota RAV4, and a Honda CR-V. All of them have 'lane-centering' features, but none of them are good at present. And none of the companies say that they will allow OTA (or any other periodic) updates, even though presumably it would be possible to improve performance without upgrading the hardware.
Why do they do this? Because their business model is to keep selling/leasing new cars. They don't want you to have the newest tech on your older car.
If they had subscriptions for features like these, it would give them a different incentive, which could be good in some cases. It might still be bad on balance (like if they charged huge amounts for these features), but there could be some significant upsides.