Doombots difficulty = health
We are already in a meta where bronze-tier skill plus health items means you are invincible and still dealing damage. So Riot takes this condenses it down to a gamemode that puts this cancer to the extreme.
Bronze tiered bots with multi-shot abilities and the difficulty meter is just there to set the health of the bots. A more simple game mode could not be thought of. Bring back Dominion; there was more thought and skill put into that.