[emerongi]

Yes they do. There is too much software to be written. A person with adequate knowledge of higher abstractions can produce just fine code.

Yes, if there is a nasty issue that needs to be debugged, understanding the lower layers is super helpful, but even without that knowledge you can figure out what's going on if you have general problem-solving abilities. I certainly have figured out a ton of issues in the internals of tools that I don't know much about.

Get off your high horse.