There may be lots of legroom in the rear seats, but there will certainly be passengers who wish they could slide their feet under the front seats. For example, extra footroom could make it easier for tall people to conveniently create a level lap for their computer without asking the driver to abandon the most comfortable seat height.
Here's an unhappy scenario: a large person sitting in the rear seat is enjoying the extra footroom available because the driver raised the seat. Then, after stopping for a quick charge, the front seat occupants switch places and the new driver drops the seat to its lowest position, crushing the-rear seat occupant's feet. Let's hope they acquired enough charge to reach the nearest hospital.
I'm aware that the design of nearly every part of a vehicle requires compromises. Evidently, Hyundai couldn't design a seat that goes that low while also incorporating a slot for rear passengers' feet. I'd be surprised if Hyundai didn't consider this aspect of their design a compromise.