Just for sake of clarity, formal analogy is a valid, non-fallacious argument because it's based on parity of reasoning.

The original comment made a pretty good, arguably formal analogy between asbestos and C. The only way to dismiss the conclusion is if there were no alternative to asbestos, then you're kinda forced to use asbestos. This is the case for C in some contexts, like some microcontrollers that only come with C compilers. It's not generally true that we need C for much else though.