I can understand those legit reasons and they ultimately fixed it, but I still don't understand how it negatively affects others gameplay experience or why its legit reason to "dislike" it. We like to say things often like "Play a build you don't need to do lab in", but at the same time things like "Legion sucked because a HH was required for the emblem encounters" or "Soandso build is useless without the X lab enchant". HH is no more required for the emblem encounter any more or less than the lab is for any one build, or any helm enchantment. HH will enhance the encounter and make it the best it can be, so does lab on nearly every build, and so to helm enchantments. Why is min/max optimization such a critical issue to highlight only when headhunter is involved?
There are tons of builds that delete uber bosses in seconds, but there's never a call for those to get nerfed -- only HH, and only because it clears fast. Everyone seems to ignore the fact its a horrible shitty bossing build, and a weak build in general. A pure HH build can't even clear uber lab I'd bet (I sure can't). A pure HH build has trouble clearing maps too unless you beyond it or give it lots of sextant juice.
Play what you enjoy to play, who cares what others do. So long as its not exploitative, this is a game that lets you do a shitload of things in a shitload of ways, and no one build is the best at everything. Every build has its strengths and weakness, HH is just one thing among many.