This might be more appropriate for the NBA thread, but I don't ever post there.
There are eight teams remaining the 2021 NBA playoffs: Philadelphia, Atlanta, Milwaukee, Brooklyn, Utah, LA Clippers, Denver, and Phoenix.
Five of those teams (Suns, Jazz, Nets, Nuggets and Clippers) have never won an NBA title, and the Clippers and Nuggets have never made the NBA finals (the Nets -- then known as the New York Nets -- did win two ABA titles on the strength of Julius Erving).
The other three teams (Sixers, Hawks and Bucks) have won 5 NBA titles between them (3 by the Sixers, one by the Hawks, and one by the Bucks). The most recent of those titles was in 1983 by the Sixers (again, led by Dr. J). Prior to that was the Bucks in 1971, the Sixers in 1967, and the ST. LOUIS Hawks in 1958.
In NFL terms, this would be like having the final 8 teams be the Browns, Jaguars, Jets, Dolphins, Falcons, Vikings, Bears and Cardinals.