The main reason to dig down is to uncover faults and leaks in abstractions, which is something you absolutely will have to do in the fullness of time. A coroll

The main reason to dig down is to uncover faults and leaks in abstractions, which is something you absolutely will have to do in the fullness of time. A corollary reason is to improve your "mechanical sympathy" when writing high-performance code. Many of what we once called "application devs" -- now more commonly "full-stack devs" -- will never have to discover real mechanical sympathy, which is fine. But there is a glass floor for such people.