New archer skeletons... any good use? (theorycrafting)

Some obvious things...

1. As ranged phisical minions with limited lifetime they lack in number and speed comparatively to phantasms (in Soulwrest - 20 phantoms), but can be summoned directly, and Phantoms demands desecrate+offering/VD

2. As ranged elemental minions they definitely outclassed by mage skeletons (archers cant use doublecast (spell echo) or even triplecast (with pledgeofhands)

So, any idea about what they can do, what cant do phantasms or mages?