I'm going to hazard a guess that it's because the tech isn't quite there yet? People pay expensive money for photoshoots because of the quality but as far as I'm aware generative technology isn't quite there yet? Or who knows, you guys could be the breakthrough!
Yeah, it's slowly getting there but hard to reach 100% so will need QA to touch up for a long time. But the hybrid approach gets better rendering than photoshop vendor image (at least shopper have difficult spotting).