Ai are sometimes useless

Why are the ai sometimes really useless
Like in pvp some if the heros dont use the ability they have specifically some healers
Its getting really annoying that they cant fix this I thoigh maybe after the update it is fixed but still no fix for healers like moss or matador they can play for like 2 minutes in pvp and dont do any healing at all
I already sent it to the support but still no fix for it