Patience is the superpower of big MTTs. In deep stack tournaments like WCOOP, SCOOP, or large fields on GGPoker/PokerStars, the one who survives the most is the guy who waits for the +EV spots without forcing. Those "jackpot steals" or heroic calls on weak hands are the fast track to the rail — and to eternal tilt.
You are 100% right: playing calmly, without pressure, you double up 80-85% of hands pre-flop and explode in the spots where amateurs vomit.