My current vehicle- 2017 Chevy Bolt also had zero defects upon delivery and has only been back to the dealership one time in 3yrs/44K mi to address a non-operational (cosmetic) issue.
It is possible to mass produce cars with zero or close to zero defects. I had a 2014 Volt before the Bolt, that had no defects on delivery, and before that I had a 2012 Plug-In-Prius, that also had zero defects.
Some of the defects we're seeing on these early MY's are just due to rushed/sloppy workmanship due to extreme circumstances during the manufacturing process.