Yes, because something like an engineering margin or extra capacity for unpredictable situations is a bad thing. /s People do not learn. No safety margin means

Yes, because something like an engineering margin or extra capacity for unpredictable situations is a bad thing. /s People do not learn. No safety margin means things will fail so you need to expect failure. Even if you do expect failure, there is a chance of unexpected kind of failure. Failures tend to be much more costly than the extra capacity. And that's in predictable systems, not something as unpredictable as say an ssh server.