Earlier quoted context omitted.
eh.. in my experience those who always spent time sharpen their knifes barely create anything useful, even code looks mediocre because they only want to play so what they write against are likely to be some non realworld puzzle. And "But I write a compiler" is also that.
There are a lot of useful things that don't have any business value, also in software. There is no business value in writing and maintaining a compiler for instance (not anymore at least), yet without compilers, no software with 'actual business value' could be created.
If you take something away and no one will ever notice it has no business value. If people do notice, it has business value. Very simple right?