User laumars was apparently misinterpreting part of a comment by saying that "unused" errors (not warnings, but errors) would in fact save the hypothetical "someone" that was claimed to be not disciplined enough to remove unused imports at release time. But the parent comment was in fact saying that the disability to handle something as simple as unused imports would prevent said programmer to accomplish the less trivial things that programmers are expected to do and for which no tools is a substitute for.

My personal view on this is that warning the user should be enough. The compiler designer is basically saying: I can't trust developers to fix warnings and it is my duty to protect them from their own laziness by enforcing a certain way of working. This apparently attracts a certain kind of people. I prefer to be the one telling the compiler what to do, instead of the reverse.