I think it would roughly be the same back then as it is now. You have artists that take time to craft art and really make it special and reflective of the era they are in and you’d have artists that just quickly release to stay popular or on whatever wave is poppin.
Just like you had Jay-Z releasing yearly and featuring on other popular artists singles/albums (ala Drake) you’d have a Nas, who took 2-3 years in-between projects to craft a work of art (ala Kendrick)
Someone like Q-Tip, no matter the era, probably wouldn’t be flooding the streets with random music. He’d want to build a body of work he was proud of and could stand on.