Whether it's r&b or not is just a matter of musical style, that r&b style will have become less popular after a while I suppose like everything does once people have heard too much of it. Pop is always changing it's style to suit the musical climate of the time.
And I think the 80s was more about pop in general than the 90s, so some pop groups may have come to prominence in the 90s who wouldn't have done so well in the more competitive 80s.
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