Agree/Disagree

In a conversation with a fellow poker player about sng strategy, he summarized his theory: I disagreed STRONGLY with this...maybe i'm wrong, but please give me your opinions:

"the key in sng's is to never have to go all in. every person who is serious about sng's will tell you that"

"you can play hard with out putting all of your chips at risk"

"you should NEVER have to go all in without the nuts before the blinds get to 100/200 unless you are desperately short stacked"

talking PP sngs, 11's or 22's.