I don't think this is an entirely fair comparison. I thinks it's closer to the Post Office being worried about finding enough new drivers for their mail routes, but refusing to upgrade any of their delivery trucks from a manual transmission to an automatic one.

Sure, you can argue that learning to drive a standard isn't that hard, and if you want to do a valuable public service like delivering mail, then learning to drive one is a small price to pay. But it's a barrier to entry for most young drivers because automatic transmissions are far, far more common. Besides, not only is the constant starting/stopping like a mail truck does usually hardest part of driving a manual, but isn't even fundamentally coupled to the act of delivering mail.

There's plenty of competent drivers who might be willing to deliver mail using an automatic (or developers to maintain the kernel on a platform with a decent UX), and that kind of process overhead isn't something that should just be waved away.

Edit: Changed accidentally repeated phrasing in middle paragraph