The root from his Q is like a second ultimate and I'm not sure why it was implemented in the first place. On top of the defensive bonuses from the spell; Extra armour, health regeneration etc, it now has an offensive aspect to it, why?
Countless players are abusing it, and keeper can just purchase Elders and Ghost Marchers and 1 shot everything around the map which is quite extreme for a 'push bot/walking ultimate' hero as you just stated