It's not "less ICM involved". But the ICM is completely different, almost reversed.
If there is a guy who's about to be all in from the blinds, if you have a small stack you want to save your tournament life, but you can afford to "gamble" with some hands with a big stack while risking your tournament life against the chip leader. Here's why:
$3.50 Buy In
You have 3000 chips. Your stack is worth your tournament life + 10 cents for every 100 chips. Your tournament life is worth 3.50 (not considering fee) plus 30x0.10 = $6.50
When you call a shove you are risking $6.50 to double up your stack which will be worth $3 more.
So... risking 6.50 to win 9.50 total means you have to have around 69% equity with your hand to be calling.
Now... Let's say you have 1000 chips in the same scenario.
You are risking 3.50 + 1.00 to win 1.00 = 4.50 to win 5.50 total = 81% equity needed to be break-even calling. Meaning calling only AA.
So yeah, while at DoNs you basically have to fold AA when you have big enough stack to survive, you can "gamble" with AA, KK and probably QQ too at Fifty50 with a bigger stack.
But when you are the smaller stack your risk-reward is really bad and you should be calling really really tight and try stealing against players that do the same but watch out for players that would spite call you.
Obiously those are some of the more extreme and very simplified examples and don't take blinds and antes, different stack sizes, player tendencies and FGS into account but I hope you get the point.