I don't think many people wear plate because of the attack speed decrease. This is a VERY big nerf to many people like me who don't use fast swords, and I would never take on this nerf for my life. The other nerf is the sleep one, with which I'm not too fussed about because about only 2 monsters can deal sleep, and you regain heal while you're inflicted.
My main concern are the 4 star plate armour things, Heavy Plate Mail and Heavy Plate Helm. In tier 3, monsters so pure special damage (piercing, shadow and elemental), and the plate set has VERY high normal resistance. But it has no special resistance.
So literally the plate set in tier 3 is useless until you get to 5*.
Surely you shouldn't have an Attack Speed nerf, a Sleep nerf with only a useless normal resistance and stun resistance for 4* plate mail?
No, not even most monsters do pure special damage in T3. Not at all. Only certain gremlins, turret bullets, and maybe one other thing do. A lot have split and a few do pure normal