Because having someone who isn't using a shield block with an invisible shield, while being exactly the sort of thing that I'd expect to see in a Larian game, would be silly and undesirable.
But if you make the rng for miss effect sensitive to that - so only shield users rng a miss as a shield block, and only armour wearers can rng an effect as an armour deflection - well, then you've more or less got something very similar to what the original post is suggesting.
Last edited by Niara; 30/10/21 01:17 AM.