Sure, if you focus only in what Postscript was capable of, however many of the ideas were possible via the Objective-C Kits.
That is the part of NeXT that many miss, and it also has in common with SunOS/NeWS, the UNIX compatibility was only the bottom layer, the cool parts were above it.
https://news.ycombinator.com/item?id=22456575
There are a lot more interesting DonHopkins comments in this thread:
https://news.ycombinator.com/item?id=22455722