> Minor design revisions would be needed, new software, and lots of drivetrain stuff would need to be retested. All of those changes would push a series releas

> Minor design revisions would be needed, new software, and lots of drivetrain stuff would need to be retested. All of those changes would push a series release very far into the future. A "minor design revision" incurs a mountain of verification / validation / testing etc. It will be much cheaper and faster waiting for the components.