I mean, no one would buy the Ioniq 5 N specifically if they didn't want the zoomy car sounds! (OK maybe they just want the fastness! Fair enough)

But yes, they can be turned off.

There's probably a federal or local law requiring some sound. Like the Waymos that incessantly beep beep beep when backing up at the recharging station at 1 mph. You're about five years away from hearing beep beep beep everywhere you go due to the proliferation of driverless vehicles.

The N-line is Hyundai's high-performance designator, like Type R for Honda. It has way more power than you would ever need for normal driving, hopefully to be used on a track and not street racing. The normal Ionic 5 has no faked engine noise (beyond the low-volume external sounds required by law).

I like Hyundai's HDA much more than Tesla's.

With Tesla it's all-or-nothing, and when it inevitably drives poorly, I can only turn it off. It physically resists me turning the steering wheel while it's driving, and overcoming the resistance results in an unpleasant and potentially dangerous jerk.

OTOH in IONIQ I can control lane assist and adaptive cruise control separately. The lane assist is additive to normal steering. It doesn't take over, only makes the car seem to naturally roll along the road.