It's a bit erroneous to say Wolfenstein 3-D was developed on NeXT machines; John Romero states in his autobiography Doom Guy that Carmack bought the first one in preparation for Doom development, after the Wolf3D demo had already shipped, by which point the Wolf3D engine was finished. The game's art was done in DeluxePaint and the levels were done in TED, both mature DOS programs, so at that stage, however many NeXTstations they had (Romero only mentions the first purchase) would mostly have been curiosities.
It's a bit erroneous to say Wolfenstein 3-D was developed on NeXT machines; John Romero states in his autobiography Doom Guy that Carmack bought the first one in preparation for Doom development, after the Wolf3D demo had already shipped, by which point the Wolf3D engine was finished. The game's art was done in DeluxePaint and the levels were done in TED, both mature DOS programs, so at that stage, however many NeXTstations they had (Romero only mentions the first purchase) would mostly have been curiosities.
Excellent catch, thank you for correcting me on that. The article has been updated :)