The familiar 200bb migration: pairs peel wider, AK calls, thin value 4-bets disappear.
AK begins migrating from 4-bet to call — stacking off 200bb with one-pair hands is no longer automatic.
Your hijack steal ran into the cutoff's 3-bet — position against you, and a range that knows your open was wide.
Assumes a standard 3-bet; 4-bet to ~2.2–2.5x the 3-bet. Deep, favor calls over 4-bets — a 4-bet pot at 500bb+ commits you with range disadvantage.