To me logging is different from recording.
I'll often log transmissions for a couple of reasons. One is to get a feel for which channels seem to be more active than others. Another reason, probably insignificant to many, is to document newly discovered Radio ID numbers for a system that I'm particularly interested in. I know the method for assigning Radio IDs and how they relate to call numbers. So if a new unit comes on line, one I do not have "alpha-tagged", I can add it to my list.
On recording, while I listen to the scanner quite often, I don't continuously listen to it. So I may get a "wild hair" and turn the recording feature on, just to listen to stuff I may have missed. Yeah, it is after the fact, but I look at it like bread - a half a loaf is better than no loaf.