The less moving parts you have,the less likely you'll have a failure,& since Pea whistles are dependent upon the Pea to function as a whistle(did you try it without the pea?)Pealess whistles Eliminate that worry,Alltogether!
Yes, that's true in theory, but I think it's such an unlikely concern that it's not worth bypassing some outstanding whistles that have a pea. For comparison, I view fire starting gear (including tinder) to be about 100 times more delicate than a pea whistle.
I'm interested in people describing how a pea whistle actually malfunctioned on them, what brand it was, the conditions, etc. As far as trying a pea whistle WITHOUT the pea, all my pea whistles must be destroyed in order to remove the pea. So, no, I did not try this!