as it was meant to be in first place only players broke difficulty in half by designing addon working around it.
and thus devs have choice - either design even harder encounters or break some addons which became to big help.
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and he is not wrong about it - the moment that addon gives unfair advantage it should be disabled/broken as its not the way devs designed this game.
i will give another example - handynotes - it broken whole draenor treasure hunting sense since you had them on your map sicne day 1 - it wasnt what they designed it to be. instead spending dozens of hours looking for treasure people were done in couple runing from point A to point B without looking for them at all.