Yeah, that's some brilliant mold engineering!

>minimal mold lines

I think this comes from higher tonnage (clamp force) molding machines. Injected plastic exerts force at the mold seam. Pressing the mold open by even a teeny tiny amount is unpalatable. Mold lines also can result where a mold has insertable parts, like sliding rods to form inner holes.

You weren’t kidding. I just took a look and the models are gorgeous!