It's still possible to hold enmity against anything short of a Leeroy with the early skillset, even against ilvl sync capped players with a mediocre geared tank. You just have to be careful on where to land the enmity combo, which requires watching and predicting DPS. Managing resources for the AoE enmity move is important. Overdo it, and you'll have to spend some time recovering, during which impatient DPS could turn Leeroy.

I can see the merit of forcing new tanks to focus on that, but they could still be given a bit of breathing room. There is a middle ground though! A weakened tank stance could be given early, and then later brought to full strength with traits.