How is an aircraft flight controls software a good example? I think everyone would agree someone building such software should know how a plane works. But do they have to be an aeronautical engineer? No. Where do you draw the line? There is a difference between flight control where lives are at stake and say spitting out a CRUD feature as fast as possible to see if anything sticks to reach market before the competition, then switching gears accordingly. If I deep-dived and skilled up to excellence on every technology I touched I'd still be on the first one. If all software were designed to NASA standards we would not be where we are now.

I don't expect a web designer to know how NAND gates or how to program in C because it's irrelevant. If they spent time learning that on the job, that's likely a waste of time. Abstractions exist for a reason.

I agree completely though that lazy people are out there. Professionals should always be learning and trying to improve their craft. Learning the bare minimum shouldn't be the default.