My point is that your confidence level depends on your task. There are many tasks for which I'll require ECC. There are other tasks where an LLM is sufficient. Just like there are some tasks where dropped packets aren't a big deal and others where it is absolutely unacceptable.
If you don't understand the tolerance of your scenario, then all this talk about LLM unreliability is wasted. You need to spend time understanding your requirements first.
The chance that the flipped bit changes a bit that results in a new valid state and one that does something actually damaging is astronomically small.
Meanwhile LLM errors are common and directly effect the result.