Those are just assertions, and they are plainly wrong. Quoting from the article that @T.j_Runyon posted:
As Thomas Eisner shows in his article “Chemical Defense Against Predation in Arthropods” (Chemical Ecology, 1970, pp. 157-215), hydrogen peroxide is a normal metabolic byproduct in insects, and various quinones are used to harden (or “sclerotinize”) the cuticle of insects. All kinds of insects therefore secrete these chemicals. As a byproduct, hydroquinone tastes bad to predators and is the chemical that makes stink bugs stink. So, if an insect’s cuticle became indented, forming little sacs to store some of this hydroquinone, it would have an advantage over its fellows even if its storage mechanism was not yet very efficient.
Schildknecht himself points out that the carabid family of beetles has little sacs like this. They have glands that exude enzymes into pygidial bladders that empty into the anus, even though these don’t explode. So, even though the bombardier beetle is the only carabid beetle to shoot boiling liquid at its enemies, the other carabid beetles, living in different ecological niches, survive very well because, with their thick-walled little sacs, they can poison their enemies but not themselves.The Bombardier Beetle Myth Exploded | National Center for Science Education
Therefore, the system is not dependent on the presence of the catalysts present in the bombardier beetle. There is function with fewer parts. This is yet another example of how you incorrectly assume the present system could not work without all of the parts.
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