that was kind of the point of saying "going out of focus", playlists are largely compiled from focus groups .... what tests well, what does not test well.
There are plenty of Classic Rock, Oldies, Golden Oldies,and Classic Hit songs that may have been popular back in the time of their release, and even for a decade later, that if you heard them on the radio today you would cringe... Billy Don't Be A Hero would be a good example... I'm sure that tests like crap, and even without a focus group anyone who adds it to their playlist, or on the three stations in the North American markets where the air talent can pick their songs ever played that song, I suspect the hotline would be lit up before they got to the first refrain.
With all due respect to Barry Scott of The Lost 45's (TM) those songs are not lost, they are put away for a reason!
They do well on specialty shows though