Set-mining arrives even out of position — 200bb pays for it — while the thinnest 3-bets retire.
Calling ranges widen before 3-betting ranges do — set-mining and suited-connector calls gain value faster than thin 3-bets.
Small blind against a cutoff steal: mostly 3-bet or fold. Flatting builds multiway pots you play blind-first for the rest of the hand.
Assumes a ~4bb open; 3-bet to ~3x the open in position, ~4x from the blinds — larger as stacks deepen.