what I'm trying to say (not very well ) the majority of us can associate a record with a time in our lives, i.e venue, dj etc and that most of the records available these days, whatever the source, already have a place in our memories and that many of the DJ's these days you can't compare to eras past due to the fact they are all playing what the previous DJ's played, except for a small percentage who are lucky enough to have the right contacts.
These days, certainly the past ten years or so too few DJ's prepared to use their imagination a bit and many have the sheep mentality and just follow the trends, rather than try and set a few trends, the records are out there if they look hard enough.
Thats why I can't compare many of todays DJ's with DJ's of the past, when many used their imagination and had their own identity and playlist.
As for common sense, that goes out the window much of the time