"It's complicated". Heh. I was in a relationship like that once. Trust me, it only gets worse.
When I designed parts in the auto industry, Kia & Hyundai (same parent company) were two of my customers. They were beyond horrible to deal with. I believe most of the issues I had were rooted in cultural differences, but geez.... what a total PITA. They didn't have the first clue what they wanted, but they wanted it right f-ing now. When you attempted to explain to them repeatedly why what they asked for wouldn't work, then gave it to them anyway, and it didn't work, they'd be pissed. Ugh. After dealing with them for a couple years I swore I'd never own one of their cars.
They put a belt on the V6 for NVH reasons. It's quieter and smoother than a chain.