Stun is fine. Having a shield is a nice thing.
When you sling it behind your back or decide not to take one, well. But 1h weapons are designed to be used with shield. If someone wants to intentionally play hard mode, there is no need to make it easier; and if someone wants a more effective sidearm without spending an extra slot, or to be more effective with no shield, then I don't think that is so good, no.