This.
Unless you've never played frost or something, no one is going to WJ low HP adds purposefully. You always WJ a target that you know will live long enough (and if not, then you just eat the DPS loss if there is a gain for w/e reason for WJing something). All the issues that WarcraftMages brings up are easily just fixed with macros and not tunneling whatever target you're on.
AKA git gud