You need to consider that for the sake of balancing you are killing fun that is in game. Knight Armor is just example. If you keep doing that, soon you will have perfect game.. that is boring.
I mean trading a lingering windwall for a potential ~250 resists for 6 seconds doesn't sound horrible to me given it's a 30s CD.
I think SBI mostly succeeded in their design goals of limiting plate escape potential for something that's still desirable to use in midscale to ZvZ fights.
Also don't change items into group mode pvp only.
We have solo PVE and PVP as well..