Strategic Bombing Directives ...
I suppose that Feb 42 Directive contained a lot of compromise, in that the RAF was being tasked with what it was capable of doing. By that I mean by night, with limited aids to navigation and bombing in unpredictable weather, never mind the opposition from night fighters and flak.
There was no point in tasking BC with precision bombing of individual factories or other pinpoint targets - the means simply weren't available.
... IMHO, E&OE