Starting to get sick of the lack of comprehension.
If there are more troops in an area, the Warden buffs them all, which means there has been a larger HP buff in total compared to there being less troops in the area. By using mass witches (which spawn up to 5 skeletons), you are exploiting the fact that there isn't a limit on the number of troops buffed in the Warden's area.
This is making witches (a spam attack with no strategy), currently stronger than any well thought out 3* plan in a STRATEGY game.
There's no nerf to the Warden's amount of HP buffed to a single troop. There's no nerf to witch's base stats. This is fixing the fact that witches spawn so many troops that get buffed, defences can't break through that wall of HP sufficiently.
I'm not going to reiterate again because your repetitive "you don't know anything" isn't an argument, it's merely an exclamation from someone who can't get 3 stars without exploits in the game.

