Plus it was one of the few portrayals of a working class family and their struggles. Here’s an article about it

In the first season’s finale, Roseanne inspires her fellow workers to quit their jobs when a new supervisor raises quotas on production; she then jokingly compares herself to Sally Field’s character in Norma Rae. And a 1992 episode features a skeptical speech directed to a state representative who promises tax breaks for corporations as a way to revitalize the local economy. Audiences—and advertisers—took notice: The AFL-CIO aired a pro-union commercial featuring the famed labor activist Lech Walesa during a 1989 episode of the series.