The National Review is a right-biased source. However, Business Insider, which is cited in the article, is a left biased source. While this story appears to be factually accurate, the presentation is intended to be partisan rather than purely informative.
I would be interested to compare Harris with any other elected officials in national office that have been prosecutors or trial attorneys. The legal profession in general tends to require outrageously long hours, and has a high burn-out rate, so it wouldn't surprise me if that culture carried over with any national elected figure that had been in a similar office previously.
Okay, now apply the same standard to the offices of every single politician that worked as a trial attorney. My guess is that you'll see exactly the same kind of high-pressure environments. Is it healthy? No. But should anyone be singling out a single person out of a political motivation if the problem is endemic to that kind of politician? Also no.