SoD rune ability crits not applying Deep Wounds?

As Deep Wounds were updated in SoD just as many other abilities with runes, I realised when an ability from a rune (eg: Devastate), or an off hand attack from a new abilitty (eg: Blood Surge Slam, Enraged Whirlwind) critically strikes, Deep Wounds does not get applied.

It would be nice if Deep Wounds could be applied by offhand special attacks as well. Don’t really know whether it should apply a different debuff, apply Deep Wounds with the main hand wepon damage or just replace the current application, but if that’s a crit, it does woons (at least so says the talent tooltip).

Thoughts?