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This is indeed a vastly underappreciated point.

One issue here is the resulting fragility of the economy. If crucial nodes of competence were to be wiped out by disaster, domino effects could have system-level implications as recovery might take too long.

On a more personal level, people more and more lack the competence to understand non-local connections of the world they live in. Resulting in them not being able to judge consequences and making according mistakes.

Related video illustrating your last point using the example of a pencil: https://youtu.be/IYO3tOqDISE

This is the Faustian bargain of technology: We advance collectively but each of us becomes a tiny cell in some giant organism we can't even perceive. Living entirely apart from that will someday be as impossible as a skin cell in your arm trying to strike out on its own.