[c_o_n_v_e_x]

>They really should have had someone to say ‘you can’t ship that’ when the topic of glue to hold mirrors came up.

I work in product at a hardware company and have a lot of domain experience which came from spending years in the (literal) field. There's been many times where I write a product spec and the engineers are incredulous. "Really? It gets THAT hot?" or "Do we really need to provide a bonding/grounding lug on the case?"

It's not uncommon to find engineering teams with deep domain experience in one area, but completely lacking in others. Ignoring domain experience, there should have been rigorous product testing during design that would have weeded out the glue issue.