Click bait title. They are considered harmful by the author primarily due to the authors own moral code and opinions.
I mean...no shit? I won't entirely go out on a limb here but I really can't recall any article titled "X considered harmful" that wasn't an opinion being stated.
Without the massive community backlash towards it a couple of years ago I have no doubt they would have been successful.
Way better than Dijkstra being pithy about everything.
Title is click-bait, article has no impact on my decision making process when purchasing TLDs.