Now as for your overall point:
Bosses will never stop following a player once aggroed, so mages and archers can simply run in the opposite direction while button mashing auto fire and never be caught unless a lag spike hits. I'm not sure you were aware that range works against a mob while you are moving and facing opposite the mob 180 degrees. Any archer that has been rely on thorn root to solo a mob quite frankly doesn't understand the class very well.
And if you ever run out of space in the dungeon you cleared out getting to the boss, simply knock the boss back or stun the boss. Range kiting is still by far the most effective means of killing a boss.
This change was made to make the game a little harder and more tactically challenging. While you may feel that you are loosing a tactical advantage, the reality is you will now have to use just a tiny bit more tactics as a group in order to easily defeat bosses (often in less than 10 seconds). And even now, its still comically easy to beat dungeons in this game. I'm actually quite surprised you are so displeased about it. It makes sense for bosses to be immune to certain effects, such immunities are what makes them powerful, more of a challenge, and thus a "boss".
Edit: They already rolled back some of the changes they made, by allow stuns and fears etc to work once again.
There is no reason to complain about this change.
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