Every car here since forever ago has these and it's a good idea! It adds conspicuity at night and lets you gauge the size of the vehicle from any angle since you know where the front and rear are.
Imported models often didn't think about this requirement so their side-markers are VERY tacked-on.
Hyundai didn't exactly forget about it, but I'll nominate the Ioniq 5 as having the tiniest rear side markers of any car because they're adorable.
But they're there and they work!