[pc86]

There really shouldn't be any "serious and unfixable way" to break things, especially in a modern company that uses technology in any meaningful way. The fact it's even possible to get into an unrecoverable state is the primary issue.

[Nicook]

That's literally always possible? The idea is to put up walls and fail-safes to minimize the chance.

[pc86]

You should always be able to either undo what you did or rebuild to identical infrastructure and nearly-identical data.