The big difference is that "Hey, Siri" isn't a privacy threat at all, and that Apple doesn't generally allow people to snoop on all of my supposedly-secure traffic and then say "oh, there was no problem" when confronted with it.

About the closest they've come to that was the "goto fail" bug from a year ago or so, and that gave every appearance of being a mistake, and Apple didn't try to claim that it wasn't a problem (although they were, as usual, pretty quiet about the exact nature of the problem).