Hmm, does 4 engines really add to survivability? Looking at recent-ish cases like the 777(?) the Russians shot down over Ukraine or the case in Iran a few years

Hmm, does 4 engines really add to survivability? Looking at recent-ish cases like the 777(?) the Russians shot down over Ukraine or the case in Iran a few years ago, after being hit they go down pretty solidly whether they have 2 or 20 engines. I guess the one case where 4 engines might be useful is if somebody sneaks up with an IR-guided manpad near an airport. Such a small missile might just take out an engine without breaking up the entire plane. Then again, in a war if you're operating AF1 anywhere close where hostile missiles are a concern, you're doing something wrong.