A report is the most important component of your investigation. It’s the bit that communicates your findings. The bit that explains what went wrong and the bit in which you express your recommendations which can change the future for the better. Nobody likes writing reports. Nobody really likes writing anything; this applies to professional writers as much than to the rest of us who have to write to communicate, on top of our other responsibilities.
Fortunately, there are some ways of making it a relatively painless process and a good thing too, because writing a report is absolutely crucial to any investigation and after all it is the whole point of investigating in the first place.