Conveniently, those are the subdomains of the tech industry that require a deep understanding of CS theory (eg embedded systems) and DS&A, and yet whenever the subject of Leetcode comes up on HN, software “engineers” swoop in to argue how useless those are as a whole to 90% of the software being built in the world today…

Which, really, implies that 90% of people in this industry work in bullshit jobs that don’t require real engineering skills. You could even spout any BS about architecture in Medium.com and then asked to speak in a conference if it gets enough views.