"Can you guarantee that your LR will inflate? Can you guarantee that everyone will be able to get in it safely ... you are assuming that a LR = 100% safety guaranteed - which is bolx"

"In 7 cases liferafts were deployed of which two were entirely successful, one failed to work and the other 4 were only partially successful."

"advice is based on fact and not speculation on what "might" happen."
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To all these comments, there is one definite conclusion.

If you DO NOT have a LR, then you can be 100% certain, that it cannot work!

Yes there are failures.

Yes there are few situations when they have been used in anger by yotties.

So, does this still allow you to say with certainty that they are a waste of space?

This is definitely bolx (as you say).