1.2.0 - Shadowstrike Restriction

[Doctornull]

Apparently in 1.2 Shadowstrike is restricted to dual-wielding.

So you can Shadowstrike with:
- Two daggers (but not one dagger)
- Two whips (but not one whip)
- A shortstaff and a dagger (but not any other kind of staff)
- Two shortstaves via Reaving Combat (but not one regular staff)
- Two Mindstars
- etc.

This is screwing over my Striker class and screwing over an idea for a single-weapon Duelist rogue class.

What are the specific benefits to this new 1.2 restriction? Why should shortstaff + mindstar be allowed to auto-crit while regular staff is not?