BSD had a slow start, not "Intel 32 bit operating systems": other flavors of Unix were delivered before 1991.

SCO UNIX was delivered in 1989: https://en.wikipedia.org/wiki/OpenServer#Versions

BSD was slow because in the early 1990s they had a major constraint before working on ports: they had to get rid of AT&T code whose licenses were very expensive and blocking distribution. The cleaning was complete in June 1991.

Source: https://en.wikipedia.org/wiki/Berkeley_Software_Distribution...