The period from the mid-'70s through the mid-'90s saw the very definition of country music broaden to the point that you could hear records with strong bluegrass, honky tonk, folk, pop and rock influences being played on the same stations, along with the cheatin' and drinkin' songs traditionally associated with Nashville country music.
Its my view that things haven't changed a bit since then, with the addition of rhythmic hip-hop (or hick-hop) to the repertoire.
Keep in mind that today's country artists grew up on 80s & 90s country, so they see the genre from that perspective.