Comment by twoodfin

The best direct reporting on this comes from Jobs himself in the so-called “lost” interview with Bob Cringely:

Jobs:

I had 3-4 people who kept bugging me that I ought to get my rear over to Xerox PARC and see what they were doing, and so I finally did. I went over there. And they were very kind, and they showed me what they were working on, and they showed me, But I was so blinded by the first one that One of the things they showed me was object-oriented programing. They showed me that, but I didn’t even see that. The other one they showed me was, really, a network computer system. They had over 100 Alto computers, all networked, using email, et cetera, et cetera. I didn’t even see that. I was so blinded by the first thing they showed me, which was the graphical user interface. I thought it was the best thing I’d ever seen in my life.

https://sameerbajaj.com/jobs/

NeXT was, at its core, about getting back to the other two things.