I miss Apple's confidence in their OS design. System 6 - Mac OS 8 (maybe even 9) are so similar in design, like all they really did for 7 and 8 was add a bit of shading/depth. Seriously, here's a screenshot of System 4 "Open File" dialog vs. Mac OS 9's "Open File" dialog:
System 4.2: https://guidebookgallery.org/pics/gui/interface/dialogs/open...
OS 9: https://guidebookgallery.org/pics/gui/interface/dialogs/open...
(and here's System 7's, somewhere in the middle: https://guidebookgallery.org/pics/gui/interface/dialogs/open... )