Also, honestly, the build. That “genuine concern” they ignored was that the build was critically flawed. I don’t think anyone here would have these takes if a small group of curious engineers tried their hand at a composite submersible, it was when they kept doing it after all the qualified engineers had said, “This is crazy, I’m out.”
The build was kind of dumb, and I’m hardly an engineer. It’s common sense. Carbon fiber composites are interesting because they’re strong relative to their weight. Remove either of those features and they become pointless.
Who cares if a submarine is heavy?