It makes sense alright.

The qualities that are needed to grind the algorithms, system design, and what have you have a nice correlation with success later

Perseverance, diligence, sheer will to grok the somewhat boring shit.

Even writing some code in the notepad/whiteboard means you have enough mental RAM/stack/context window to keep the bits in the head.

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So it ain’t no “magic potion”. Ideally we had a less strenuous thing ( Bloodborne/Dark Souls platinum trophy for the diligence part? :-) ) but you can’t always have what you want.