The whole point of having canary builds is that they're unstable. That's why they're called canary. Rockets failing in test flights isn't a bad thing.
I hate to be pedantic but for a whole host of environmental reasons, they are suboptimal, and it still incinerates money to lose a rocket during a flight test.
In case you aren't aware, the whole codebase of Bun did not explode into debris just because it hit a bug. They can just fix the bug and recompile.