It's a tool. Use the right tool for the job. But.
If you don't have the right tool, improvise. And if it is warranted, kick yourself really hard for not having the right tool. If improvising means you have to abuse your knife, weigh that risk against the challenge you're facing and decide which means more. In a survival situation I bet even the most hard core knife nut would give up his blade to save a life.
I guess I'm saying it is situational, and there is nothing I would refuse to do to a knife if enough was at stake.
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If it was my knife versus saving a life then yes you can use my knife to pry, cut, hammer...
If you want to open that can of beans or coffee and you are too lazy to walk over to the lunchroom to get a can opener I will open the can opener on the Leatherman or hand you a P-38.
I highly doubt your survival hinges on getting the can of soup open.