I was very hopeful when Rhapsody was announced, but quite disappointed by Mac OS X Public Beta managed to slow my PowerMac G4/400MHz at my day job down to almost the same speed as my 25MHz NeXT Cube (always was bummed I couldn't manage to justify a Turbo 33MHz machine). It took the better part of a decade for things to catch up, though my favourite version was Snow Leopard.
Still quite disappointed that MacWorld couldn't be bothered to print my letter calling out David Pogue for claiming that Steve Jobs was using an IBM ThinkPad running Windows (it of course had OPENSTEP installed, being one of the few models on the supported hardware list).
Really enjoyed using Altsys Virtuoso 2.0 and programming in Display PostScript and seeing the results on-screen in real-time --- it was more-or-less ported to Windows and Mac OS as FreeHand v4 (and a version of it was announced/advertised for Windows NT, not sure if it ever shipped) --- still resort to Macromedia Freehand when I have something which warrants having a nice pen tool/complex Bézier curve manipulation.
Glenn Reid's TouchType.app was just magical for textual logo design, and was a great example of how tightly focused small apps could be on that platform --- poste.app was simultaneously an app and a service and worth looking up for folks interested in such. Mac users should be sure to check out Services such as: https://apps.apple.com/us/app/wordservice/id899972312?mt=12
And of course, Doom was fun even in 2-bit greyscale --- that's where it was originally developed and what the map editor ran on: https://doomwiki.org/wiki/NeXTSTEP
Lots of information at:
but I rather wish that there was an analogue for NeXT to the Mac's https://folklore.org/