The advice looks sensible, but not sure if it does more good than harm. I recall simplified user interfaces standing in the way, hiding (or simply not providing) useful knobs or information/logs. They are annoying both when using them directly as a "power user", and when less tech-savvy users approach you (as they still do with those annoyingly simplified interfaces), asking for help. Then you try to use that simplified interface, it does not work, and there is no practical way to debug or try workarounds, so you end up with an interface that even a power user cannot use. I think generally it is more useful to focus on properly working software, on documentation and informative logs, sufficient flexibility, and maybe then on UI convenience, but still not making advanced controls and verbose information completely inaccessible (as it seems to be in the provided examples).
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