Except that in most cases that 2 wound t4 model has a 2+ cover, at least if you're running any sort of competitive Draigo type wing as most should have a techmarine.
2 wounds with a 2+ save isn't exactly hard to kill, either. Driagowing already spends enough points on very expensive single models. At least the Techmarine is hidden amongst the Paladins for protection.
I am the Hammer. I am the right hand of my Emperor. I am the tip of His spear, I am the gauntlet about His fist. I am the woes of daemonkind. I am the Hammer.