This kind of error shows up often when people who are freshly learning something decide they should make a tutorial of it before they even understand the subjec

This kind of error shows up often when people who are freshly learning something decide they should make a tutorial of it before they even understand the subject at anything nearing an authoritative level. It literally means everyone who follows the tutorial is doomed to make the same mistakes - it becomes part of their foundation since "that's how I learned it!" And if they're not still on board when/if the mistakes are discovered and corrected, the misinformation spreads virally. Nobody should ever follow a tutorial from someone who is still in the learning phase. Those mistakes are part of the learning, and they certainly don't belong in a tutorial. It's better to make your own mistakes than to make someone else's mistakes part of your repertoire. It's also why there are a gazillion unfinished tutorials out there. People who are not at all ready or capable of making sensible tutorials eventually peter out, either because it is more complicated than they expected, or more work than they expected, which leaves incomplete and highly erroneous material behind to spread virally to unwitting people who unfortunately found the wrong material to learn from.