It's great to 3bet ATs hands because it gives us the momentum in the hand.
If we have spades. And the flop comes out Ah 6sp 7sp
We aren't exactly dominated and we have great odds
to make the best hand... Hands like Ak we can now make money off and AQ. As long as we play quite aggressive we can get them to either fold or hit our flush. Multi way pots are preferable as well to make this play because a lot of the time ppl won't pay our flush but we can make them pay to see the flush come out or steal the pot.