Comment by linguae

My thoughts:

1. There were far more users of the classic Mac OS than there were users of NeXTstep/OPENSTEP. Mac OS X has many of OPENSTEP’s underpinnings, but it wasn’t OPENSTEP 5.0; it was Mac OS X, a continuation of the Mac but with new underpinnings. The interface was different enough to represent a new direction for the Mac but without turning the Mac UI/UX into that of NeXT.

2. At the time NeXTstep was under development (mid-late 1980s), the case law surrounding UI look-and-feel and how much borrowing and inspiration one could have before it became infringing wasn’t settled. Apple had lawsuits with Digital Research and Microsoft over whether GEM and Windows infringed on the Macintosh’s look-and-feel. Recall that NeXT was formed after Steve Jobs’ failed coup at Apple against then-CEO John Sculley. Apple sued NeXT due to Jobs’ poaching of key Apple employees who worked with him on the Macintosh and allegations that NeXT was going to use Apple’s intellectual property (in some ways NeXT could be thought of as the evolution of the “Big Mac” project Steve Jobs worked on before his departure). They ended up settling out of court, but given Apple’s litigious nature and given the history of how NeXT came to be, it was very wise for NeXTstep to feature a UI/UX that was a radical departure from the Macintosh. While I don’t think a lawsuit about right-hand scroll bars would succeed, having them on the left helps defend against allegations that NeXTstep ripped off the Mac.